Technical Support Document

For the April 3, 2009

Pagosa Springs Exceptional Event

Prepared by the Technical Services Program

Air Pollution Control Division

Colorado Department of Public Health and 

Environment

May 29, 2012
2

Table of Contents

1.0 Introduction ......................................................................................................................................................4

1.1 PM10 Standards.............................................................................................................................................4

1.2 Event Overview............................................................................................................................................4

2.0 Meteorological analysis of the April 3, 2009, blowing dust event and PM10 exceedance at Pagosa Springs...7

3.0 Ambient Monitoring Data and Statistics ........................................................................................................51

3.1 Historical Fluctuations of PM10 Concentrations Pagosa Springs......................................................................59

3.2 Monitoring Data and Conclusions.....................................................................................................................64

4.0 News Accounts and Credible Evidence..........................................................................................................65

5.0 Local Dust Control Measures.........................................................................................................................69

6.0 Laboratory and Field Data ..............................................................................................................................71

7.0 Summary and Conclusions.............................................................................................................................72

8.0 References......................................................................................................................................................74

Figures

Figure 1. 24-hour PM10 readings for April 3, 2009 .....................................................................................................8

Figure 3. Surface analysis for 0Z April 4, 2009, or 5 PM MST April 3 .......................................................................9

Figure 4. 500 mb analysis for 12Z April 3, 2009, or 5 AM MST April 3 ..................................................................10

Figure 5. 500 mb analysis for 00Z April 4, 2009, or 5 PM MST April 3 ...................................................................10

Figure 6. Flagstaff, Arizona sounding analysis for 0Z April 4, 2009, or 5 PM MST April 3.....................................11

Figure 7. Surface streamlines16Z April 3, 2009, or 9 AM .........................................................................................11

Figure 8. Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 15:41Z April 3, 

2009, or 8:41 AM MST April 3...................................................................................................................12

Figure 9. Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 18:41 UTC April 3, 

2009.............................................................................................................................................................16

Figure 10. Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 02:41 UTC April 

4, 2009.........................................................................................................................................................16

Figure 11. Surface streamlines 19Z April 3, 2009 or 12 PM MST April 3, 2009 ......................................................17

Figure 12. Surface streamlines 03Z April 4, 2009 or 8 PM MST April 3, 2009 ........................................................17

Figure 13. Friction velocities in meters/second from the NOAA NCEP North American Model with 12 kilometer 

grid spacing at 0Z April 4, 2009 ................................................................................................................19

Figure 14. MODIS satellite imagery of blowing dust in northeast Arizona, southeast Utah, northwest New Mexico, 

and southwest Colorado on April 3, 2009 .................................................................................................20

Figure 15. MODIS satellite imagery of blowing dust in northeast Arizona, southeast Utah, northwest New Mexico, 

and southwest Colorado on April 3, 2009 .................................................................................................21

Figure 16. NOAA HYSPLIT MODEL Matrix area for HYSPLIT Matrix forward trajectories in Figures 17 through 

19 ...............................................................................................................................................................21

Figure 17. NOAA HYSPLIT 24-hour forward trajectories for 15 UTC April 3, 2009 (8 AM MST). .......................22

Figure 18. NOAA HYSPLIT 24-hour forward trajectories for 17 UTC April 3, 2009 (10 AM MST). .....................23

Figure 19. NOAA HYSPLIT 24-hour forward trajectories for 23 UTC April 3, 2009 (4 PM MST).........................24

Figure 20. Percent of Normal Precipitation 3/1/2009 – 3/31/2009.............................................................................26

Figure 21. Precipitation 3/1/2009 – 3/31/2009 (.........................................................................................................26

Figure 24. Drought status for the western U.S. on March 31, 2009 ...........................................................................29

Figure 25. NAAPS forecasted dust concentrations for 11 AM, 5 PM, and 11 PM MST, April 3, 2009 ....................30

Figure 26. NASA descriptive text for image in Figure 14..........................................................................................31
3

Figure 27. Smoke Text Product from the Satellite Services Division - Descriptive Text Narrative for Smoke/Dust 

Observed in Satellite Imagery through 0045Z April 3, 2009.....................................................................32

Figure 28. U.S. Forest Service, April 3, 2009, 3 PM Weminuche Wilderness Area ..................................................33

Figure 29. U.S. Forest Service, Weminuche Wilderness Area Baseline ....................................................................33

Figure 30. Center for Snow and Avalanche Studies in Silverton, Colorado, log of events that deposited dust on the 

snow pack in the San Juan Mountains.......................................................................................................34

Figure 31. PM10 Seasonal Concentrations in Pagosa Springs March and April, 2009 ................................................53

Figure 32. Pagosa Springs PM10 Time Series for 2009 ...............................................................................................54

Figure 33. Alamosa PM10 Time Series for 2009..........................................................................................................55

Figure 34. Breckenridge PM10 Time Series for 2009 ..................................................................................................56

Figure 35. Breckenridge PM10 Time Series for 2004 - 2009 .......................................................................................57

Figure36. Mount Crested Butte PM10 Time Series for 2009 ......................................................................................58

Figure37. Pagosa Springs PM10 Six Year Time Series................................................................................................59

Figure 38. Five Year Time-Series Graph of PM10 in Pagosa Springs..........................................................................60

Figure 39. Histogram of PM10 Data in Pagosa Springs (1992 – 2009)........................................................................62

Figure 40. Monthly Pagosa Springs PM10 Box and Whisker Plot (1992 – 2009) ......................................................63

Tables

Table 1. Wind and weather observations for Winslow, Arizona, by the University of Utah MesoWest site .............13

Table 2. Wind and weather observations for Window Rock, Arizona, reported by the University of Utah MesoWest 

site .................................................................................................................................................................14

Table 3. Wind and weather observations for Hopi, Arizona, reported by the University of Utah MesoWest site .....15

Table 4. Wind and weather observations for Farmington, New Mexico, reported by the University of Utah 

MesoWest site ...............................................................................................................................................35

Table 5. Wind and weather observations for Cortez, Colorado, reported by the University of Utah MesoWest site.36

Table 6. Wind and weather observations for Alamosa, Colorado, by the University of Utah MesoWest site ...........38

Table 7. Wind and weather observations for Telluride, Colorado, by the University of Utah MesoWest site ...........39

Table 8. Wind and weather observations for Montrose, Colorado, by the University of Utah MesoWest site ..........41

Table 9. Wind and weather observations for Gunnison, Colorado, by the University of Utah MesoWest site ..........42

Table 10. Wind and weather observations for Pagosa Springs, Colorado, reported by the University of Utah 

MesoWest site .............................................................................................................................................44

Table 11. Wind and weather observations for Grand Junction, Colorado, reported by the University of Utah 

MesoWest site .............................................................................................................................................46

Table 12. Storm Reports for the National Weather Service Flagstaff Forecast Office on April 3, 2009....................48

Table 13. Pagosa Springs PM10 Concentrations Before and After April 3, 2009 Regional Dust Storm......................51

Table 14. Pagosa Springs PM10 Monitoring Data Summary .......................................................................................60

Table 15. Percentile Values for April 3, 2009 PM10 Concentrations...........................................................................61

Table 16. Month and Year PM10 Monitoring Data Summary......................................................................................61

Table 17. No Exceedance But For the Event Test .......................................................................................................64

Attachments

Attachment A - Grand Junction, Colorado, Blowing Dust Climatology

Attachment B - Hourly MesoWest Surface maps for April 3, 2009

Attachment C - Streamline Analyses for April 3, 2009

Attachment D - NWS Grand Junction, Colorado, Forecast Office, NWS Albuquerque, New Mexico, Forecast 

Office and NWS Flagstaff, Arizona, Forecast Office (High Wind Advisories, High Wind 

Watches, and High Wind Warnings for April 3, 2009)
4

1.0 Introduction

1.1 PM10 Standards

In July 1987, the U.S. Environmental Protection Agency (EPA) promulgated National Ambient Air 

Quality Standards for Particulates with an aerodynamic diameter of 10 microns or less (PM10). This is a 

size range that can affect the upper airways and can be inhaled into the alveolar regions of the lungs. The 

standard has one form, a 24-hour standard of 150 μg/m3. The annual arithmetic mean standard of 50 

μg/m3 was revoked on October 17, 2006. The 24-hour standard is attained when the expected number of 

exceedances for each calendar year, averaged over three years, is less than or equal to one. The estimated 

number of exceedances is computed quarterly using available data and adjusting for missing sample days. 

A data recovery of 75 percent is needed for each calendar quarter to be considered a valid quarter of data. 

This standard was modified in by EPA in July 1997, but was subsequently nullified back to this form in 

May 1999.

1.2 Event Overview

On Friday April 3, 2009, Pagosa Springs Colorado recorded an exceedance of the twenty-four-hour PM10

standard with a concentration of 225 ug/m3 at the Pagosa Springs School monitor. The Colorado 

Department of Public Health and Environment (CDPHE), Air Pollution Control Division (APCD), has 

prepared this report for the U.S. Environmental Protection Agency (EPA) to demonstrate that the elevated 

PM10 concentrations in Pagosa Springs and other areas of Colorado and the exceedance of the National 

Ambient Air Quality Standard (NAAQS) for PM10 in Pagosa Springs were caused by a natural event, 

specifically a dust storm. It will be shown that this exceedance and the high PM10 readings are the 

consequence of a dust storm in the Four Corners area. This event meets the criteria outlined by the final 

“Treatment of Data Influenced by Exceptional Events” Rule (72 FR 13560). This report and the analysis 

and data contained within it show that this exceptional event passed the four required tests (a) through (d) 

under 40 CFR 50.14 (3)(iv). These tests are: 

(a) The event satisfies the criteria set forth in 40 CFR 50.1(j) which requires that an exceptional event 

“affects air quality, is not reasonably controllable or preventable...” and that such events are “...natural 

event[s]”. 

(b) There is a clear causal relationship between the measurement under consideration and the event that is 

claimed to have affected the air quality in the area. 

(c) The event is associated with a measured concentration in excess of normal historical fluctuations, 

including background; and 

(d) There would have been no exceedance or violation but for the event. 

Elevated 24-hour PM10 concentrations were recorded across Colorado on April 3, 2009. All of the noted 

April 3, 2009 twenty-four-hour PM10 concentrations were above the 95th percentile concentrations for 

their locations. The Pagosa Springs concentration is greater than the 99th percentile, and a conservative 

estimate of the dust storm contribution to the total concentration is 182 – 188 μg/m3. This is evidence that 

the event was associated with a measured concentration in excess of normal historical fluctuations 

including background. But for the dust storm to be described in detail in this report, there would have 

been no exceedance on this day in Pagosa Springs. 
5

This exceedance was the consequence of strong gusty winds ahead of a deep low pressure with a trailing 

cold front, in combination with dry conditions, which caused significant blowing dust across parts of 

Arizona, New Mexico and Colorado. These winds were partly the result of a developing low pressure 

centered over southwestern Utah with a cold front trailing to the south as well as a second low pressure 

system over south-central Wyoming. These low pressures merged and centered over Colorado on April 

3, 2009. Surface weather analyses show an area of low pressure affecting the Four Corners region. Winds 

in the dust source regions of northeast Arizona and in Flagstaff, Arizona were 74 mph on April 3, 2009. 

Surface winds of 20 to 54 mph with gusts of 25 to 91 mph were recorded across the Four Corners region 

on April 3, 2009. These speeds are above the thresholds for blowing dust identified in EPA draft 

guidance and in detailed analyses completed by the State of Colorado. 

Widespread restrictions to visibility occurred in the mountains of southwestern Colorado in the area that 

includes Pagosa Spring. These restrictions were not accompanied by periods of sustained high winds 

above the blowing dust thresholds. Such restrictions in the absence of wide-spread local sources and/or 

winds above blowing dust thresholds are diagnostic for blowing dust that is being transported into the 

region.

EPA‘s May 2, 2011 draft Guidance on the Preparation of Demonstrations in Support of Requests to 

Exclude Ambient Air Quality Data Affected by High Winds under the Exceptional Events Rule states 

“Empirical evidence shows that a sustained wind speed of 25 mph is typically the minimum wind speed 

needed to entrain particles from many stable surfaces ...” In addition, in both eastern and western 

Colorado it has been shown that wind speeds of 30 mph or greater and gusts of 40 mph or greater can 

cause blowing dust (see references for the Natural Events Action Plan for High Wind Events – Lamar, 

Colorado and the Technical Support Document for the January 19, 2009 Lamar Exceptional Event and 

Attachment A - Grand Junction, Colorado, Blowing Dust Climatology at the end of this document). For 

this blowing dust event, it has been assumed that sustained winds of 25 mph and higher or wind gusts of 

40 mph and higher can cause blowing dust in northeast Arizona, northwest New Mexico, and southwest 

Colorado.

Climatological data for March and April shows that most of the Four Corners area had received less 

than normal precipitation for the period of interest. Soils in many areas of the Four Corners region had 

below normal moisture, and northeast Arizona was abnormally dry. Winslow in northeastern Arizona 

received only 0.05 inches of precipitation during the 30 days prior to April 8, 2009. This total is well 

below the approximate threshold for blowing dust conditions at Hopi identified in the analysis contained 

in Attachment A. Both wind speeds and soil moisture in the Four Corners area and northeastern Arizona 

were conducive to the generation of significant blowing dust.

Friction velocities calculated for the region also help to explain why blowing dust originated in the Four 

Corners region. Even undisturbed desert soils normally resistant to wind erosion will be susceptible to 

blowing dust when friction velocities are greater than about 1.0 to 2.0 meters per second. High values 

above 2.0 meters per second were present within the Little Colorado River Valley and Painted Desert 

region of northeast Arizona where satellite imagery shows the eruption of large plumes of blowing dust. 

Note that blowing dust will typically only occur where these values are high and the soils are dry and not 

protected by vegetation, forest cover, boulders, rocks, etc. This is why blowing dust occurred in the 

desert and more arid areas of northeast Arizona and northwest New Mexico on April 3, 2009. The high 

friction velocities and the data on soil moisture conditions presented elsewhere in this report prove that 

this dust storm was a natural event that was not reasonably controllable or preventable.

Satellite imagery shows large plumes of southwest to northeast trending blowing dust in the Painted 

Desert and Little Colorado River Valley region of northeastern Arizona on April 3, 2009. Satellite 

imagery also shows this dust moving across the Four Corners into southwest Colorado. Backward 
6

trajectories, wind streamline analyses, and surface and upper-level wind patterns show that this dust 

would have been transported into Colorado on April 3, 2009. Multiple sources of data and analyses of 

past dust storms in this area prove that this was a natural event and, more specifically, a significant 

natural dust storm originating in northeastern Arizona and northwestern New Mexico. But for the dust 

storm on April 3, 2009, this exceedance would not have occurred.

The Center for Snow and Avalanche Studies (http://www.snowstudies.org/index.html) has been studying 

the effects of desert dust deposition on snowpack albedo and snowmelt in the San Juan Mountains of 

Colorado. The center’s log of events lists April 3, 2009, as one of twelve Dust-on-Snow events for the 

2008/2009 water year. Web cam photos from the Shamrock site in southwestern Colorado support the 

conclusion that widespread blowing dust was present on April 8, 2009. NOAA’s Satellite Service 

Division also describes blowing dust moving from Arizona to southwest Colorado on April 3, 2009. 

Multiple reports from professional experts at other institutions substantiate the conclusion that this was a 

natural event. But for the dust storm on April 3, 2009, this exceedance would not have occurred.
7

2.0 Meteorological analysis of the April 3, 2009, 

blowing dust event and PM10 exceedance at 

Pagosa Springs.

On Friday April 3, 2009, Pagosa Springs Colorado recorded an exceedance of the twenty-fourhour PM10 standard with a concentration of 225 ug/m3 at the Pagosa Springs School monitor. 

Elevated readings were recorded at the Alamosa Municipal monitor with a twenty-four-hour 

PM10 concentration of 107 ug/m3 , at the Alamosa Adams State College monitor with a twentyfour PM10 concentration of 92 ug/m3 , at the Mount Crested Butte monitor with a twenty-fourhour PM10 concentration of 80 ug/m3 , and at the Breckenridge monitor with a twenty-four-hour 

PM10 concentration of 79 ug/m3 as shown in Figure 1. All of these twenty-four-hour PM10

concentrations are above the 90thpercentile concentrations for their locations. This is evidence 

that the event is associated with a measured concentration in excess of normal historical 

fluctuations including background. 

This exceedance and the elevated readings were the consequence of strong gusty winds ahead of 

a deep low pressure with a trailing cold front, in combination with dry conditions which caused 

significant blowing dust across parts of Arizona, New Mexico, and Colorado. The strong, 

prefrontal winds were partly the result of a 992 millibar low pressure centered over southwestern 

Utah and a 993 millibar low pressure centered over south-central Wyoming with a cold front 

trailing to the southwest from each low pressure as shown in the 12Z April 3, 2009 (5 AM MST ) 

surface analysis in Figure 2. These low pressures merged and intensified into a broad 986 

millibar low pressure centered over Colorado at 5 PM MST as shown in the 0Z April 4, 2009 (5 

PM MST April 3) surface analysis in Figure 3. Areas north of the frontal boundary in Figures 2 

and 3 did not have elevated PM10 readings. 

These surface features were associated with a strong upper level trough digging into the western 

U.S. as shown in Figure 4. Figure 4 presents the 500 millibar analysis for 12Z April 3, 2009 (5 

AM MST). The 500 millibar analysis shows a strong trough over the western U.S., with a wind 

speed maximum of 100 knots over Quillayute, Washington, (near Seattle) and strong height falls 

over portions of California and Nevada. Wind speed maxima and height falls of this magnitude 

and at this location in relation to the trough are indicators of a strong and intensifying system. 

Figure 5 shows the 500 millibar analysis for 00Z April 4, 2009 (5 PM MST April 3) which 

indicates that the trough continued to intensify during the day. Winds at 500 millibars over the 

dust source regions of northeast Arizona increased to 65 knots. 

Figure 6 contains the afternoon sounding at Flagstaff, Arizona, at 00Z April 4, 2009 (5 PM MST 

April 3). It shows that there was good mixing to near the 500 millibar level or about 17,000 feet 

above ground level (AGL). In this mixed layer there were winds to 65 knots. Once the morning 

inversion had dissipated, the momentum associated with the winds above the inversion mixed 

down to the surface intensifying the surface winds induced by the surface pressure gradients 

associated with the surface low pressure system. The interaction between surface and upper level 

conditions caused strong gusty surface winds across portions of Arizona, New Mexico, and 

Colorado. The dust picked up by the strong gusty winds would have become suspended 

throughout the deep mixed layer. This would have allowed the dust to be transported long 

distances.

The Painted Desert in northeast Arizona has been shown to be a source region for dust deposited 

in Colorado (see Streater, 2009, and the Grand Junction, Colorado, Blowing Dust Climatology in 

Attachment A). Figure 7 is the surface streamline analysis for 16Z April 3, 2009 (9 AM MST). 

This analysis shows the winds streaming north from northeast Arizona into the areas of Colorado 
8

that experienced elevated PM10 readings including Pagosa Springs. Northwestern Colorado 

including Grand Junction did not have elevated PM10 concentrations. The streamline analysis in 

Figure 7 shows winds from the northwest in northwestern Colorado which was on the back side 

of the front shown in Figures 2 and 3 and in a cleaner air mass than the air mass that was loaded 

with suspended dust from source regions in northeast Arizona and northwest New Mexico. 

Figure 1. 24-hour PM10 readings for April 3, 2009.
9

Figure 2. Surface analysis for 12Z April 3, 2009, or 5 AM MST (from NCDC, SRRS Analysis 

and Forecast Charts http://nomads.ncdc.noaa.gov/ncep/NCEP ).

Figure 3. Surface analysis for 0Z April 4, 2009, or 5 PM MST April 3 (from NCDC, SRRS 

Analysis and Forecast Charts http://nomads.ncdc.noaa.gov/ncep/NCEP ).
10

Figure 4. 500 mb analysis for 12Z April 3, 2009, or 5 AM MST April 3 (from NCDC, SRRS 

Analysis and Forecast Charts http://nomads.ncdc.noaa.gov/ncep/NCEP ).

Figure 5. 500 mb analysis for 00Z April 4, 2009, or 5 PM MST April 3(from NCDC, SRRS 

Analysis and Forecast Charts http://nomads.ncdc.noaa.gov/ncep/NCEP ).
11

Figure 6. Flagstaff, Arizona sounding analysis for 0Z April 4, 2009, or 5 PM MST April 3

(http://weather.uwyo.edu/upperair/sounding.html).

Figure 7. Surface streamlines16Z April 3, 2009, or 9 AM MST (from Plymouth State Weather 

Center http://vortex.plymouth.edu/u-make.html)
12

EPA’s May 2, 2011 draft Guidance on the Preparation of Demonstrations in Support of Requests 

to Exclude Ambient Air Quality Data Affected by High Winds under the Exceptional Events Rule 

states “Empirical evidence shows that a sustained wind speed of 25 mph is typically the minimum 

wind speed needed to entrain particles from many stable surfaces (i.e., undisturbed/natural 

surfaces with a crust or disturbed surfaces that have been restabilized) in the western U.S. where 

rainfall is seasonal (see Appendix A), and thus is a useful threshold for setting differential 

expectations for the detail to be included in a demonstration that dust from a wind event was not 

reasonably controllable or preventable.” In Eastern Colorado it has also been shown that wind 

speeds of 30 mph or greater and gusts of 40 mph or greater can cause blowing dust (see 

references for the Natural Events Action Plan for High Wind Events – Lamar, Colorado and the 

Technical Support Document for the January 19, 2009 Lamar Exceptional Event and Attachment 

A - Grand Junction, Colorado, Blowing Dust Climatology). ” Sustained winds of 25 mph and 

wind gusts of 40 mph will be used for blowing dust thresholds in this report.

Winslow, Arizona is near the south end of the region in northeast Arizona that includes the 

Painted Desert. Strong winds began around 8:30 AM MST on April 3, 2009 in Winslow with 

gusts of 60 mph as shown in Figure 8 (the MesoWest surface map for 15:41Z or 8:41 AM MST) 

and the surface observations for Winslow in Table 1. Winds strong enough to cause blowing dust 

in the dust source region of northeast Arizona continued into the early evening. Evidence for this 

is presented in the observations at Winslow, Window Rock, and Hopi, Arizona, in Tables 1 

through 3 and the MesoWest Surface maps for 18:41Z April 3, 2009 (11:41 AM MST) in Figure 

9 and 02:41Z April 4, 2009 (7:41 PM MST, April 3) in Figure 10. The corresponding Surface 

Streamline Analyses for 19Z April 3, 2009 (Noon MST) in Figure 11 and 03Z April 4, 2009 (8 

PM MST April 3) in Figure 12 show that the air that flowed over the dust source region of 

northeast Arizona continued to stream into the portions of Colorado that experienced elevated 

PM10 concentrations. A series of MesoWest surface maps for the event are presented in 

Attachment B. In addition, a full series of hourly surface streamline analyses for April 3, 2009

can be found in Attachment C.

Figure 8. Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 

15:41Z April 3, 2009, or 8:41 AM MST April 3 (http://www.met.utah.edu/mesowest/).
13

Table 1. Wind and weather observations for Winslow, Arizona, reported by the University of 

Utah MesoWest site (http://www.met.utah.edu/mesowest/) for April 3, 2009. Speeds at or above the 

blowing dust thresholds, weather, and visibility (caused by or reduced by dust) have been 

highlighted in yellow. Winds highlighted in blue are winds not likely causing or carrying dust 

due to precipitation and or they are in a different air mass.

Time 

in 

MDT 

(April 

3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in 

mph

Wind 

Gust 

in 

mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

23:56 39 32 24 32 250 clear 10

22:56 39 39 22 29 230

mostly 

clear 10

21:56 38 44 22 28 240 clear 10

20:56 37 52 16 25 270 clear 10

19:56 36 79 25 45 270 lt rain 10

19:03 45 66 31 43 270 lt rain 8

18:56 46 51 32 43 270 lt rain 7

17:56 55 35 36 43 200 lt rain 10

16:56 59 20 38 54 210 clear 10

15:56 65 15 37 51 220

mostly 

clear 10

14:56 65 15 40 54 200 clear 10

13:56 66 17 44 49 190 clear 10

12:56 65 20 40 53 210 clear 10

11:56 64 22 39 54 220 clear 10

10:56 62 23 41 59 210 haze 4

10:34 61 25 49 62 220 haze 2

10:19 61 27 45 60 220 haze 3

10:05 61 25 54 63 210 haze 2.5

9:56 60 28 43 62 220 haze 4

9:49 61 27 48 66 210 haze 2.5

9:29 59 27 49 69 220 haze 1.75

9:22 59 29 48 60 220 haze 3

9:11 57 28 47 60 220 haze 1.75

8:56 57 31 44 56 220 haze 3

8:51 57 33 40 60 220 haze 3

8:46 55 35 45 62 220 haze 1.5

8:38 55 35 47 60 220 haze 2.5

7:56 53 38 9 17 190 clear 10

6:56 51 39 12 22 180 clear 10

5:56 47 42 5 120 clear 10

4:56 48 39 9 130 clear 10

3:56 51 35 5 clear 10

2:56 51 35 7 170 clear 10

1:56 53 31 16 28 200 clear 10

0:56 54 30 22 29 190 clear 10
14

Table 2. Wind and weather observations for Window Rock, Arizona, reported by the University 

of Utah MesoWest site (http://www.met.utah.edu/mesowest/) for April 3, 2009. Speeds at or above 

the blowing dust thresholds, Weather, and Visibility (caused by or reduced by dust) have been 

highlighted in yellow. Winds highlighted in blue are winds not likely causing or carrying dust 

due to precipitation and or they are in a different air mass.

Time 

in 

MDT 

(April 

3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in 

mph

Wind 

Gust 

in 

mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

0:00 27 80 23 41 250 unknown prcp 2

23:53 27 78 24 44 250 unknown prcp 3

23:48 27 80 21 40 250 unknown prcp 2.5

22:53 30 81 18 25 230 lt snow 7

22:51 28 93 15 230 lt snow, fog 4

22:46 28 93 15 21 250 lt snow, fog 1

22:44 28 93 14 21 260 lt snow, fog 0.75

22:08 30 93 8 24 260

mod snow, ice 

fog 0.5

21:53 31 92 13 21 270

mod snow, ice 

fog 0.5

21:43 32 86 14 21 280 lt snow, fog 0.75

21:35 32 93 10 22 290 lt snow, fog 1.25

21:24 34 86 14 33 300 lt snow, fog 0.75

21:18 34 86 24 33 260 lt snow, fog 1.75

20:53 39 59 39 60 240 lt rain 4

19:53 48 26 37 48 210 overcast 10

18:53 51 21 29 46 230 mostly clear 10

17:53 53 19 36 49 230 mostly clear 9

16:53 58 15 44 55 230 mostly clear 8

15:53 54 27 31 45 220 partly cloudy 10

14:53 58 23 32 48 230 clear 7

13:53 58 24 31 47 220 clear 9

12:53 57 24 29 46 220 mostly clear 10

11:53 55 31 26 41 210 clear 10

10:53 51 38 30 40 210 clear 10

9:53 48 44 26 39 220 clear 10

8:53 44 55 9 16 200 clear 10

7:53 39 59 6 180 clear 10

6:53 35 64 6 200 clear 10

5:53 38 57 9 160 clear 10

4:53 38 57 5 170 clear 10

3:53 39 55 7 150 clear 10

2:53 38 57 5 150 clear 10

1:53 41 48 9 240 clear 10

0:53 43 45 17 28 220 clear 10
15

Table 3. Wind and weather observations for Hopi, Arizona, reported by the University of Utah 

MesoWest site (http://www.met.utah.edu/mesowest/) for April 3, 2009. Speeds at or above the 

blowing dust thresholds, Weather, and Visibility (caused by or reduced by dust) have been 

highlighted in yellow. Winds highlighted in blue are winds not likely causing or carrying dust 

due to precipitation and or they are in a different air mass.

Time in 

MDT 

(April 

3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in mph

Wind 

Gust in 

mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

23:13 33 87 22 36 266

22:13 31 94 24 37 258

21:13 33 91 22 31 253

20:13 35 84 16 26 236

19:13 35 91 26 41 276

18:13 34 91 21 52 287

17:13 52 28 33 52 222

16:13 57 23 38 52 230

15:13 60 20 35 51 217

14:13 60 21 38 54 215

13:13 60 21 38 56 230

12:13 58 25 32 43 240

11:13 56 30 31 44 230

10:13 55 29 31 45 212

9:13 55 33 24 37 215

8:13 51 37 28 39 204

7:13 48 44 19 25 196

6:13 45 47 15 24 193

5:13 42 44 1 21 150

4:13 45 43 13 19 201

3:13 46 44 13 20 212

2:13 45 48 6 15 213

1:13 44 55 5 8 230

0:13 43 47 2 14 241
16

Figure 9. Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 

18:41 UTC April 3, 2009 or 11:41 AM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).

Figure 10. Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 

02:41 UTC April 4, 2009 or 7:41 PM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).
17

Figure 11. Surface streamlines 19Z April 3, 2009 or 12 PM MST April 3, 2009 (from Plymouth 

State Weather Center http://vortex.plymouth.edu/u-make.html).

Figure 12. Surface streamlines 03Z April 4, 2009 or 8 PM MST April 3, 2009 (from Plymouth 

State Weather Center http://vortex.plymouth.edu/u-make.html).
18

In a 1997 paper “Factors controlling threshold friction velocity in semiarid and arid areas of the 

United States” (Marticorena et al., 1997), the authors have characterized the erodibility of both 

disturbed and undisturbed desert soil types. The threshold friction velocity, which is described in 

detail in this paper, is a measure for conditions necessary for blowing dust and is higher for 

undisturbed soils and lower for disturbed soils. Friction velocities have been calculated for 0Z 

April 4 2009 (5 PM MST April 3) using the NARR NAM12 model (data source: 

http://nomads.ncdc.noaa.gov/data.php?name=access#hires_weather_datasets). These friction 

velocities are shown in Figure 13. According to Marticorena and coauthors (1997), even 

undisturbed desert soils normally resistant to wind erosion will be susceptible to blowing dust 

when threshold friction velocities are greater than about 1.0 to 2.0 meters per second.

Figure 13 shows that most of Arizona and New Mexico and portions of southwestern and southcentral Colorado had friction velocities well above 2.0 meters per second. Some of the highest 

values were within the Little Colorado River Valley and Painted Desert region of northeast 

Arizona where the April 3, 2009, MODIS satellite imagery in Figures 14 and 15 shows the 

eruption of large, dense plumes of blowing dust. Note that blowing dust will typically only occur 

where these values are high and the soils are dry and not protected by vegetation, forest cover, 

boulders, rocks, etc. This is why blowing dust occurred in the desert areas of northeast Arizona 

and northwest New Mexico on April 3, 2009. The friction velocities shown in Figure 13 and the 

data on soil moisture conditions presented elsewhere in this report prove that this dust storm was 

a natural event that was not reasonably controllable or preventable.

The NOAA HYSPLIT Model (Draxler and Rolph, 2012) has a trajectory matrix option. With 

this option, the model can calculate a grid of forward trajectories for a user-defined matrix of 

source locations on a map. A matrix was created for the area shown on the satellite image in 

Figure 14 that has blowing dust and a portion of northwest New Mexico suspected to contribute 

to this event. The matrix is illustrated in Figure 16. Winslow, Arizona is in the southwest corner 

of the matrix.

The forward trajectories in Figure 17 start at 15 UTC April 3, 2009 (8 AM MST) which is a half 

hour before Winslow began reporting winds of 47 mph, wind gusts of 60 mph, and 2.5 miles of 

visibility. These forward trajectories bring air from the matrix over Pagosa Springs, Alamosa, 

Mount Crested Butte, and Breckenridge Colorado, the sites that exceeded the standard or had 

elevated PM10 readings. Figure 18 shows the 17 UTC April 3, 2009 (10 AM MST) forward 

trajectories that start in the last hour that Winslow reported restrictions to visibility. These also 

bring air from the source matrix across Pagosa Springs, Alamosa, Mount Crested Butte, and 

Breckenridge. Figure 19 shows the forward trajectories for 23 UTC April 3, 2009 (4 PM MST) 

which is the hour that the frontal passage occurred in Winslow. It shows how the air flow 

became more westerly as the cold front moved to the south and east. This would partially explain 

why the PM10 readings were higher in Pagosa Springs and less further north in Colorado. These 

forward trajectories in Figures 17 through 19 also show that Pagosa Springs was under air 

flowing from the heart of the dust source region seen in the MODIS satellite imagery in Figure 

14, while Alamosa is in air flow from the edge of the dust source region. Lamar is under air flow 

from the southeast corner of the matrix in the forward trajectories in Figures 17 through 19. A 

large portion of the southeast corner of the matrix box is tree and grass covered and is not a 

source area for blowing dust. This helps explain why Lamar did not have elevated PM10

readings.
19

Figure 13. Friction velocities in meters/second from the NOAA NCEP North American Model 

with 12 kilometer grid spacing at 0Z April 4, 2009 (5 PM MST April 3). 
20

Figure 14. MODIS satellite imagery of blowing dust in northeast Arizona, southeast Utah, 

northwest New Mexico, and southwest Colorado on April 3, 2009 (source 

http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=37791&src=nha).
21

Figure 15. MODIS satellite imagery of blowing dust in northeast Arizona, southeast Utah, 

northwest New Mexico, and southwest Colorado on April 3, 2009, looking to the southwest 

across the Four Corners in the center of the image (source http://ge.ssec.wisc.edu/modistoday/index.php?satellite=a1&product=true_color&date=2009_04_03_093&overlay_sector=false&overlay

_state=true&overlay_coastline=true).

Figure 16. NOAA HYSPLIT MODEL Matrix area for HYSPLIT Matrix forward trajectories in 

Figures 17 through 19.
22

Figure 17. NOAA HYSPLIT 24-hour forward trajectories for 15 UTC April 3, 2009 (8 AM 

MST). The HYSPLIT model run was based on data from the high-resolution 12-kilometer grid 

spacing NAM numerical weather model. (source: NOAA Air Resources Laboratory at:

http://ready.arl.noaa.gov/HYSPLIT.php).
23

Figure 18. NOAA HYSPLIT 24-hour forward trajectories for 17 UTC April 3, 2009 (10 AM 

MST). The HYSPLIT model run was based on data from the high-resolution 12-kilometer grid 

spacing NAM numerical weather model. (source: NOAA Air Resources Laboratory at:

http://ready.arl.noaa.gov/HYSPLIT.php).
24

Figure 19. NOAA HYSPLIT 24-hour forward trajectories for 23 UTC April 3, 2009 (4 PM 

MST). The HYSPLIT model run was based on data from the high-resolution 12-kilometer grid 

spacing NAM numerical weather model. (source: NOAA Air Resources Laboratory at:

http://ready.arl.noaa.gov/HYSPLIT.php).
25

For blowing dust to occur, soils must be dry. Figure 20 maps the Percent of Normal Precipitation 

for the western U.S. during March 2009. It shows the majority of the source region for the 

forward trajectories in Figures 17 through 19 experienced 50 percent of normal precipitation or 

less for the month of March 2009, with much of the suspected source area at less than 25% of 

normal for March. Figure 21 shows the amount of precipitation for the month of March 2009. It 

shows that the source region for the forward trajectories in Figures 17 through 19 had a half of an 

inch or less of precipitation. This amount of precipitation is below the general threshold for 

conditions conducive for blowing dust identified for Hopi, Arizona, in the analysis in Attachment 

A. Figures 22 and 23 are the Record of River and Climatological Observations for March and 

April 2009 for Winslow. They show that Winslow had 0.04 inches of precipitation in the 30 days 

before April 3 – which is significantly below the general threshold for conditions conducive for 

blowing dust identified for Hopi. Figure 24 is the Drought Monitor map of drought conditions 

across the western U.S. It shows normal to abnormally dry conditions prevailed in the source 

region for the forward trajectories in Figures 17 through 19 during the week ending on April 7, 

2009. 

Figure 25 is the output for dust from the NAAPS (Navy Aerosol Analysis and Prediction System) 

Global Aerosol Model for 18Z April 3, 2009, (11AM MST), 00Z April 4, 2009, (5 PM, MST), 

and 06Z April 4, 2009, (11 PM, MST). It shows a large area of predicted dust over northeast 

Arizona at 11 AM. This area grows to cover most of Arizona, New Mexico, and central Colorado 

by 11 PM. The NAAPS model output is based on actual soil moisture content, soil erodibility 

factors, and modeled meteorological factors conducive to blowing dust (for a description of 

NAAPS see: http://www.nrlmry.navy.mil/aerosol_web/Docs/globaer_model.html). 

Consequently, NAAPS forecast products provide an independent calculation of the potential for 

blowing dust and the spatial extent of blowing dust for this event. All of the products discussed 

here point to a widespread, regional-scale dust storm that originated in portions of Arizona and 

spread to much of Colorado. 

Figure 14 presented earlier in the report contains the April 3, 2009, MODIS satellite image posted 

on April 11, 2009, on NASA’s Earth Observatory web site 

(http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=37791). It shows extensive 

blowing dust in northeast Arizona with the upper right corner of the picture showing dust being 

transported into Colorado. Figure 26 lists the posted description for this image. It describes how 

visibility was reduced to the point that Interstate 40 was closed near Flagstaff Arizona due to the 

blowing dust. Flagstaff is in the very southwest corner of the source region used in the forward 

trajectories in Figures 17 through 19. Figure 27 is the Smoke Text Product from NOAA’s 

Satellite and Information Service (Descriptive Text Narrative for Smoke/Dust observed in 

satellite imagery through 0115Z April 4, 2009, Smoke Text Product - Satellite Services Division). 

It describes blowing dust in northeast Arizona, northwest New Mexico, and southwest Colorado.

Figure 28 is the April 3, 2009, 3 PM image from the U.S. Forest Service Weminuche Wilderness 

Area Shamrock site east of Durango, Colorado. The view in this image is towards the southwest. 

Figure 29 is the baseline image for this site. The reduced visibility in Figure 28 is due to the 

transport of dust into the area. It is unlikely that there was any significant local dust contribution 

at this site since local vegetation would limit the exposed surfaces available for suspension of 

dust and reduce surface friction velocities to levels below blowing dust thresholds. The 

Weminuche Wilderness Area Vista is about 24 miles west of Pagosa Springs.

Figure 30is the “Dust-on-Snow Deposition Events Log” from the Center for Snow and Avalanche 

Studies (http://www.snowstudies.org/index.html) in Silverton Colorado. It lists April 3, 2009, as 

one of twelve Dust-on-Snow events for the 2008/2009 water year.
26

Figure 20. Percent of Normal Precipitation 3/1/2009 – 3/31/2009 (from 

http://www.hprcc.unl.edu/maps/current/index.php?action=update_product&product=TDept ).

Figure 21. Precipitation 3/1/2009 – 3/31/2009 (from 

http://www.hprcc.unl.edu/maps/current/index.php?action=update_product&product=TDept ).
27

Figure 22. Winslow, Arizona March 2009 Record of River and Climatological Observations 

(http://cdo.ncdc.noaa.gov/dly/DLY).
28

Figure 23. Winslow, Arizona April 2009 Record of River and Climatological Observations 

(http://cdo.ncdc.noaa.gov/dly/DLY).
29

Figure 24. Drought status for the western U.S. on March 31, 2009 (source: the USDA, NOAA, 

and the National Drought Mitigation Center at: http://drought.unl.edu/dm/archive.html).
30

Figure 25. NAAPS forecasted dust concentrations for 11 AM, 5 PM, and 11 PM MST, April 3, 

2009 (source http://www.nrlmry.navy.mil/flambebin/aerosol/display_directory_aer2?DIR=/web/aerosol/public_html/globaer/ops_01/wus/).
31

Figure 26. NASA descriptive text for image in Figure 14 (source 

http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=37791&src=nha).
32

FRIDAY APRIL 3, 2009 

DESCRIPTIVE TEXT NARRATIVE FOR SMOKE/DUST OBSERVED IN SATELLITE IMAGERY 

THROUGH 

Blowing dust/sand is currently blowing through extreme northeast 

Arizona, into northwest New Mexico and southwest Colorado. Also, 

blowing dust/sand is currently extending to the east in south-central 

New Mexico.

Numerous agricultural burns in Kansas and Oklahoma produced light smoke

plumes this afternoon and evening whereas a few fires in Texas produced

moderately dense to dense smoke plumes. Most of these plumes were 

observed moving to the northwest.

THE FORMAT OF THIS TEXT PRODUCT IS BEING MODIFIED. IT WILL NO LONGER

DESCRIBE THE VARIOUS PLUMES THAT ARE ASSOCIATED WITH ACTIVE FIRES. 

THESE

PLUMES ARE DEPICTED IN VARIOUS GRAPHIC FORMATS ON OUR WEB SITE:

JPEG: http://www.ssd.noaa.gov/PS/FIRE/hms.html

GIS: http://www.firedetect.noaa.gov/viewer.htm

KML: http://www.ssd.noaa.gov/PS/FIRE/kml.html

THIS TEXT PRODUCT WILL CONTINUE TO DESCRIBE SIGNIFICANT AREAS OF SMOKE

WHICH HAVE BECOME DETACHED FROM AND DRIFTED SOME DISTANCE AWAY FROM THE

SOURCE FIRE, TYPICALLY OVER THE COURSE OF ONE OR MORE DAYS. IT WILL 

ALSO

STILL INCLUDE DESCRIPTIONS OF BLOWING DUST.

ANY QUESTIONS OR COMMENTS REGARDING THESE CHANGES OR THE SMOKE TEXT

PRODUCT IN GENERAL SHOULD BE SENT TO SSDFireTeam@noaa.gov

Figure 27. Smoke Text Product from the Satellite Services Division - Descriptive Text Narrative 

for Smoke/Dust Observed in Satellite Imagery through 0045Z April 3, 2009 (Smoke Text Product -

Satellite Services Division).
33

Figure 28. U.S. Forest Service, April 3, 2009, 3 PM Weminuche Wilderness Area image looking 

southwest from the Shamrock site east of Durango, Colorado. 

(http://www.fsvisimages.com/search.aspx?site=SHAM1)

Figure 29. U.S. Forest Service, Weminuche Wilderness Area Baseline Image looking southwest 

from the Shamrock site east of Durango, Colorado. 

(http://www.fsvisimages.com/search.aspx?site=SHAM1)
34

Colorado Dust-on-Snow (CODOS)

Dust-on-Snow Deposition Events Log

Thanks to our original National Science Foundation research grants for collaborative research (grants ATM0432327 to Painter at National Snow and Ice Data Center and ATM-0431955 to Landry at Center for Snow 

and Avalanche Studies), and to the subsequent support of the Colorado Dust-on-Snow program by Colorado 

water districts the State of Colorado, the U.S. Bureau of Reclamation, and others, this program has 

accumulated several seasons of dust-on-snow observations at our Senator Beck Basin Study Area (SBBSA) at 

Red Mountain Pass, summarized in the table below. It is reasonable to assume that our skill at detecting duston-snow events has improved and that we may have failed to observe very small events during the early years 

of this work. Therefore the table represents an absence of events in grey for the first two years of observation 

but thereafter indicates an absence of observed events as “0” (zero).

Dust-on-Snow Events Documented per Month, by Winter

Senator Beck Basin Study Area at Red Mountain Pass – San Juan Mountains

Oct Nov Dec Jan Feb Mar Apr May Jun Total

2002/2003 2 1 3

2003/2004 2 1 3

2004/2005 0 0 0 0 0 1 2 1 0 4

2005/2006 0 0 1 0 1 1 3 2 0 8

2006/2007 0 0 1 0 1 1 3 1 1 8

2007/2008 0 0 0 0 0 3 3 1 0 7

2008/2009 1 0 1 0 1 4 5 0 0 12 

2009/2010 1 0 0 0 0 1 4 3 0 9

Dates of the events, by winter/spring season, were as follows (WY = Water Year):

2002/2003 (WY2003): Feb 3, Feb 22, Apr 2-3

2003/2004 (WY 2004): Apr 17, Apr 28, May 11

2004/2005 (WY 2005): Mar 23, Apr 4, Apr 8, May 9

2005/2006 (WY 2006): Dec 23, Feb 15, Mar 26, Apr 5, Apr 15, Apr 17, May 22, May 27

2006/2007 (WY 2007): Dec 17, Feb 27, Mar 27, Apr 15, Apr 18, Apr 24, May 4, Jun 6

2007/2008 (WY 2008): Mar 16, Mar 26-27, Mar 30-31, Apr 15, Apr 21, Apr 30, May 12

2008/2009 (WY 2009): Oct 11, Dec 13, Feb 27, Mar 6, Mar 9, Mar 22, Mar 29, Apr 3, 

Apr 8, Apr 15, Apr 24, Apr 25

2009/2010 (WY 2010): Oct 27, March 30, April 3, April 5, April 12, April 28, May 9, 

May 11, May 22

Figure 30. Center for Snow and Avalanche Studies in Silverton, Colorado, log of events that 

deposited dust on the snow pack in the San Juan Mountains.
35

Surface observations for Winslow, Window Rock, and Hopi, Arizona, presented in Tables 1- 3 

earlier in this report and Farmington, New Mexico, in Table 4 are for locations within or near the 

area with blowing dust in the MODIS image in Figure 14. All four sites had extended periods 

with winds equaling or exceeding 25 mph and wind gusts equaling or exceeding 40 mph. The 

three recording visual weather conditions reported visibility restrictions due to blowing dust. 

Observation from the portion of Colorado that had elevated PM10 concentrations including 

Cortez, Alamosa, Telluride, Montrose, Gunnison, and Pagosa Springs, are listed in Tables 5 - 10. 

Things to note from these observations include. 

 Telluride, Gunnison, and Pagosa Springs had no sustained occurrences of wind speeds or 

gust speeds above the thresholds needed to cause blowing dust from local sources.

 Telluride and Gunnison had restrictions to visibility for several hours. The Shamrock 

vista image taken not too away far from Pagosa Springs showed significant blowing dust. 

 These widespread restrictions to visibility in the absence of widespread local sources 

and/or winds above blowing dust thresholds are diagnostic for blowing dust that is being 

transported into the region.

The observations for Grand Junction are listed in Table 11 and show that it was on the back side 

of the front, that the winds were below blowing dust thresholds, and that there were not any 

restrictions to visibility due to dust. The High Wind Advisories, High Wind Watches, and High 

Wind Warnings in Attachment D show that the National Weather Service expected winds strong 

enough to cause blowing dust across much of western Colorado, New Mexico, and northeast 

Arizona. The National Weather Service Forecast office for northeast Arizona is in Flagstaff, 

Arizona. The Flagstaff storm reports for April 3, 2009, are in Table 12. They show wind gusts of 

58 to 91 mph across the region where the MODIS satellite picture in Figure 14 shows blowing 

dust. 

Table 4. Wind and weather observations for Farmington, New Mexico, reported by the 

University of Utah MesoWest site (http://www.met.utah.edu/mesowest/) for April 3, 2009. Speeds 

at or above the blowing dust thresholds, weather, and visibility (caused by or reduced by dust) 

have been highlighted in yellow. Winds highlighted in blue are winds not likely causing or 

carrying dust due to precipitation and or they are in a different air mass.

Time in 

MDT 

(April 3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in mph

Wind 

Gust in 

mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

23:53 36 79 12 200 overcast 10

23:01 36 93 10 250 overcast 10

22:53 34 96 12 270 lt snow 8

22:19 34 100 20 30 280 lt rain 9

22:09 36 93 24 32 280 lt rain 7

22:02 36 93 24 47 290 lt rain, fog 5

21:53 37 89 35 44 280

hvy rain, 

fog 2.5

21:11 46 49 20 25 280 overcast 9

20:53 51 32 21 25 250 haze 6

20:00 50 43 14 28 300 haze 5

19:53 52 35 17 33 300 haze 5

19:25 57 13 21 30 230 haze 5

18:53 60 12 30 44 220 mostly clear 7

18:00 63 11 30 46 230 haze 6

17:53 62 11 32 46 220 haze 6
36

Time in 

MDT 

(April 3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in mph

Wind 

Gust in 

mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

17:30 64 12 29 38 230 haze 4

17:06 63 15 30 40 210 haze 5

16:53 63 12 32 39 220 haze 4

16:04 66 12 32 45 220 haze 4

15:53 66 12 28 45 230 haze 4

14:53 66 13 28 46 220 mostly clear 7

14:49 66 12 33 46 220 haze 5

13:53 65 15 26 39 230 clear 10

12:53 65 15 31 38 230 mostly clear 9

11:53 62 20 21 30 240 mostly clear 10

10:53 59 23 12 210 clear 10

9:53 57 25 13 21 200 clear 10

8:53 49 39 7 80 mostly clear 7

8:29 48 40 9 100 haze 6

7:53 44 45 0 haze 6

6:53 42 49 3

mostly 

cloudy 8

6:48 43 49 0

mostly 

cloudy 8

5:53 41 51 5 70

partly 

cloudy 10

4:53 41 48 5 50

mostly 

cloudy 10

3:53 46 42 5 overcast 10

2:53 47 40 0 overcast 10

1:53 45 36 3

mostly 

cloudy 10

0:53 43 30 0 clear 10

Table 5. Wind and weather observations for Cortez, Colorado, reported by the University of Utah 

MesoWest site (http://www.met.utah.edu/mesowest/) for April 3, 2009. Speeds at or above the 

blowing dust thresholds, weather, and visibility (caused by or reduced by dust) have been 

highlighted in yellow. 

Time in 

MDT 

(April 3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in mph

Wind 

Gust in 

mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

23:53 33 92 3 30 mostly cloudy 10

23:05 34 86 0 overcast 10

22:53 33 92 5 160 overcast 9

22:42 34 86 3 190 lt snow 7

22:26 34 86 3 180 lt snow 7

22:22 34 86 6 180 lt snow, fog 3

22:19 34 86 6 160 lt snow, fog 1.5

22:14 34 86 8 150 lt snow, fog 0.75
37

Time in 

MDT 

(April 3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in mph

Wind 

Gust in 

mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

22:07 34 86 8 180 lt snow, fog 1.25

22:03 34 93 12 200 lt snow, fog 2

21:53 33 92 12 240 lt snow, fog 1.5

21:38 34 86 16 28 290 mod snow, fog 0.5

21:29 34 86 23 33 290 lt snow, fog 1.25

21:26 34 86 23 33 290 lt snow, fog 2

21:18 37 81 23 32 290 lt rain 10

20:53 43 57 0 overcast 10

19:53 45 51 8 21 230 overcast 10

19:27 45 57 7 29 overcast 8

18:53 48 42 20 40 270 haze 4

18:39 52 32 31 45 270 haze 4

18:31 54 26 35 44 270 haze 3

18:13 57 15 23 46 230 haze 2

17:53 58 15 28 39 230 haze 2.5

17:45 57 14 29 46 220 haze 2.5

17:19 59 14 32 40 220 haze 2

16:53 60 15 33 44 210 haze 1.75

16:19 61 16 30 44 210 haze 1.5

16:11 61 17 33 46 210 haze 1.25

16:03 61 17 36 44 210 haze 1.5

15:53 60 18 28 41 210 haze 1.25

15:36 61 18 35 45 210 haze 1.5

14:53 60 18 28 38 230 haze 2

14:48 61 17 26 38 230 haze 2

14:37 61 18 29 41 200 haze 1.75

14:20 61 17 28 40 220 haze 2

14:12 61 18 30 40 220 haze 2.5

13:53 61 18 24 39 220 haze 3

12:53 58 22 21 35 210 10

11:53 59 24 23 35 190 10

10:53 57 27 18 26 170 mostly clear 10

9:53 54 31 14 190 clear 10

9:14 52 35 15 22 130 10

8:53 50 36 10 190 10

7:53 43 51 6 240 clear 10

6:53 44 49 8 180 mostly cloudy 10

5:53 47 44 13 180 overcast 10

4:53 42 53 0 overcast 10

3:53 45 47 3 230 overcast 10

2:53 47 40 8 230 overcast 10

1:53 47 37 12 17 220 mostly cloudy 10

0:53 47 42 8 250 overcast 10
38

Table 6. Wind and weather observations for Alamosa, Colorado, reported by the University of 

Utah MesoWest site (http://www.met.utah.edu/mesowest/) for April 3, 2009. Speeds at or above the 

blowing dust thresholds, weather, and visibility (caused by or reduced by dust) have been 

highlighted in yellow. Winds highlighted in blue are winds not likely causing or carrying dust 

due to precipitation and or they are in a different air mass.

Time 

in 

MDT 

(April 

3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in 

mph

Wind 

Gust 

in 

mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

23:56 39 32 24 32 250 clear 10

22:56 39 39 22 29 230

mostly 

clear 10

21:56 38 44 22 28 240 clear 10

20:56 37 52 16 25 270 clear 10

19:56 36 79 25 45 270 lt rain 10

19:03 45 66 31 43 270 lt rain 8

18:56 46 51 32 43 270 lt rain 7

17:56 55 35 36 43 200 lt rain 10

16:56 59 20 38 54 210 clear 10

15:56 65 15 37 51 220

mostly 

clear 10

14:56 65 15 40 54 200 clear 10

13:56 66 17 44 49 190 clear 10

12:56 65 20 40 53 210 clear 10

11:56 64 22 39 54 220 clear 10

10:56 62 23 41 59 210 haze 4

10:34 61 25 49 62 220 haze 2

10:19 61 27 45 60 220 haze 3

10:05 61 25 54 63 210 haze 2.5

9:56 60 28 43 62 220 haze 4

9:49 61 27 48 66 210 haze 2.5

9:29 59 27 49 69 220 haze 1.75

9:22 59 29 48 60 220 haze 3

9:11 57 28 47 60 220 haze 1.75

8:56 57 31 44 56 220 haze 3

8:51 57 33 40 60 220 haze 3

8:46 55 35 45 62 220 haze 1.5

8:38 55 35 47 60 220 haze 2.5

7:56 53 38 9 17 190 clear 10

6:56 51 39 12 22 180 clear 10

5:56 47 42 5 120 clear 10

4:56 48 39 9 130 clear 10

3:56 51 35 5 clear 10

2:56 51 35 7 170 clear 10

1:56 53 31 16 28 200 clear 10

0:56 54 30 22 29 190 clear 10
39

Table 7. Wind and weather observations for Telluride, Colorado, reported by the University of 

Utah MesoWest site (http://www.met.utah.edu/mesowest/) for April 3, 2009. Speeds at or above the 

blowing dust thresholds, weather, and visibility (caused by or reduced by dust) have been 

highlighted in yellow. 

Time 

in 

MDT 

(April 

3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in 

mph

Wind 

Gust 

in 

mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

23:50 27 93 0 lt snow 1.75

23:30 27 93 9 300 lt snow 1

23:10 28 93 13 28 290 hvy snow 0.5

22:50 30 93 0 lt snow 1.75

22:30 32 80 3 20 160 lt snow 1.5

22:10 32 80 3 150 lt snow 10

21:50 32 80 3 80 lt snow 5

21:30 32 93 3 80 lt snow 3

21:10 32 93 6 110 lt snow 1.75

20:50 30 100 0 lt snow 2

20:30 32 93 0 lt snow 1

20:10 32 86 7 17 240 mod snow 1

19:50 34 69 8 240 lt snow 4

19:30 37 48 12 38 250 lt snow 2.5

19:10 41 30 26 35 240 haze 3

18:50 41 30 23 38 220 haze 3

18:30 41 28 6 22 180 haze 3

18:10 43 24 13 25 220 haze 3

17:50 43 26 12 26 190 haze 3

17:30 43 28 15 35 190 haze 3

17:10 43 28 5 20 190 haze 3

16:50 43 28 8 24 220 haze 3

16:30 43 36 14 29 180 haze 5

16:10 43 36 8 18 150 haze 5

15:50 41 41 10 23 210 overcast 7

15:30 41 41 12 23 190 overcast 7

15:10 41 41 16 29 140 overcast 10

14:50 41 41 9 33 160

mostly 

cloudy 10

14:30 41 38 18 31 200

partly 

cloudy 10

14:10 41 41 10 45 170 overcast 10

13:50 39 44 9 29 200 overcast 10

13:30 37 48 14 32 210 overcast 10

13:10 37 52 9 25 170 overcast 10

12:50 37 52 12 21 180 overcast 10

12:30 37 48 15 24 150 overcast 10

12:10 39 44 12 20 140 overcast 10

11:50 37 52 9 17 140

mostly 

cloudy 10

11:30 37 48 12 22 140

mostly 

cloudy 10

11:10 37 48 8 150 mostly 10
40

Time 

in 

MDT 

(April 

3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in 

mph

Wind 

Gust 

in 

mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

cloudy

10:50 37 52 5 170

mostly 

cloudy 10

10:30 36 55 9 17 210

mostly 

cloudy 10

10:10 34 64 12 22 170 overcast 10

9:50 34 69 12 17 190 lt snow 10

9:30 34 64 15 26 160 overcast 10

9:10 36 60 15 23 170 overcast 10

8:50 36 60 7 140

mostly 

cloudy 10

8:30 34 64 9 110

partly 

cloudy 10

8:10 32 74 0

mostly 

cloudy 10

7:50 32 80 5 80

partly 

cloudy 10

7:30 32 80 3 130

partly 

cloudy 10

7:10 32 80 5 180 clear 10

6:50 32 80 7 200 clear 10

6:30 34 64 12 18 230

partly 

cloudy 10

6:10 34 64 7 250

mostly 

cloudy 10

5:50 36 60 13 23 230

mostly 

cloudy 10

5:30 34 69 7 17 240

mostly 

cloudy 10

5:10 34 75 6 22 220 overcast 10

4:50 32 93 5 120 overcast 10

4:30 32 93 3 80 overcast 10

4:10 32 93 0 lt snow 10

3:50 32 93 3 60 lt snow 1.75

3:30 32 93 5 18 330 mod snow 0.75

3:10 32 86 8 280 mod snow 4

2:50 32 80 6 360 overcast 10

2:30 32 86 0 overcast 10

2:10 32 86 5 90 lt snow 10

1:50 32 86 8 120 overcast 10

1:30 32 86 8 80 overcast 10

1:10 32 86 5 40 lt snow 7

0:50 32 93 7 90 lt snow 1.75

0:30 32 86 13 16 120 lt snow 3

0:10 32 93 0 lt snow 4
41

Table 8. Wind and weather observations for Montrose, Colorado, reported by the University of 

Utah MesoWest site (http://www.met.utah.edu/mesowest/) for April 3, 2009. Speeds at or above the 

blowing dust thresholds, weather, and visibility (caused by or reduced by dust) have been 

highlighted in yellow. 

Time 

in 

MDT 

(April 

3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in 

mph

Wind 

Gust 

in 

mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

23:53 35 92 10 110 overcast 9

23:40 36 87 3 lt snow, fog 5

23:18 36 93 6 310 lt rain 8

23:03 36 100 14 280 lt rain 7

22:53 37 92 14 300 lt rain 10

21:53 44 65 5 200

mostly 

cloudy 10

20:53 44 65 0 lt rain 10

19:53 45 63 3

mostly 

cloudy 10

19:38 46 61 16 30 250 lt rain 8

18:53 47 56 17 29 280 haze 3

18:49 46 57 22 31 290 haze 3

18:35 48 50 20 32 260 haze 2.5

18:26 50 43 26 40 260 haze 1.75

18:08 52 37 23 44 260 haze 2

17:57 52 37 33 52 240 haze 1.5

17:53 52 36 23 30 240 haze 2

17:09 52 37 23 39 270 haze 2

17:02 54 32 29 36 270 haze 2

16:53 56 26 16 23 260 haze 3

16:33 57 24 15 23 180 haze 3

15:53 58 23 22 39 220 haze 4

14:53 59 25 20 39 190

mostly 

clear 10

13:53 60 24 20 25 220

mostly 

clear 10

12:53 58 26 29 41 240 clear 9

11:53 56 33 16 25 210

mostly 

clear 10

10:53 54 35 20 32 210 clear 10

9:53 50 50 29 37 210 clear 10

8:53 47 58 0 clear 10

7:53 46 53 9 190 clear 10

6:53 42 70 0 clear 10

5:53 43 70 8 170 overcast 10

4:53 43 70 0 overcast 10

3:53 43 70 3 70 overcast 10

2:53 42 79 17 30 220 lt rain 10

1:53 45 58 16 25 140 clear 10

0:53 42 70 23 32 180

mostly 

clear 10
42

Table 9. Wind and weather observations for Gunnison, Colorado, reported by the University of 

Utah MesoWest site (http://www.met.utah.edu/mesowest/) for April 3, 2009. Speeds at or above the 

blowing dust thresholds, weather, and visibility (caused by or reduced by dust) have been 

highlighted in yellow. 

Time in 

MDT 

(April 3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in mph

Wind 

Gust 

in mph

Wind 

Direction

in 

Degrees

Weather Visibility 

in miles 

23:50 27 93 0 lt snow 1.75

23:30 27 93 9 300 lt snow 1

23:10 28 93 13 28 290 hvy snow 0.5

22:50 30 93 0 lt snow 1.75

22:30 32 80 3 20 160 lt snow 1.5

22:10 32 80 3 150 lt snow 10

21:50 32 80 3 80 lt snow 5

21:30 32 93 3 80 lt snow 3

21:10 32 93 6 110 lt snow 1.75

20:50 30 100 0 lt snow 2

20:30 32 93 0 lt snow 1

20:10 32 86 7 17 240

mod 

snow 1

19:50 34 69 8 240 lt snow 4

19:30 37 48 12 38 250 lt snow 2.5

19:10 41 30 26 35 240 haze 3

18:50 41 30 23 38 220 haze 3

18:30 41 28 6 22 180 haze 3

18:10 43 24 13 25 220 haze 3

17:50 43 26 12 26 190 haze 3

17:30 43 28 15 35 190 haze 3

17:10 43 28 5 20 190 haze 3

16:50 43 28 8 24 220 haze 3

16:30 43 36 14 29 180 haze 5

16:10 43 36 8 18 150 haze 5

15:50 41 41 10 23 210 overcast 7

15:30 41 41 12 23 190 overcast 7

15:10 41 41 16 29 140 overcast 10

14:50 41 41 9 33 160

mostly 

cloudy 10

14:30 41 38 18 31 200

partly 

cloudy 10

14:10 41 41 10 45 170 overcast 10

13:50 39 44 9 29 200 overcast 10

13:30 37 48 14 32 210 overcast 10

13:10 37 52 9 25 170 overcast 10

12:50 37 52 12 21 180 overcast 10

12:30 37 48 15 24 150 overcast 10

12:10 39 44 12 20 140 overcast 10

11:50 37 52 9 17 140

mostly 

cloudy 10

11:30 37 48 12 22 140

mostly 

cloudy 10

11:10 37 48 8 150 mostly 10
43

Time in 

MDT 

(April 3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in mph

Wind 

Gust 

in mph

Wind 

Direction

in 

Degrees

Weather Visibility 

in miles 

cloudy

10:50 37 52 5 170

mostly 

cloudy 10

10:30 36 55 9 17 210

mostly 

cloudy 10

10:10 34 64 12 22 170 overcast 10

9:50 34 69 12 17 190 lt snow 10

9:30 34 64 15 26 160 overcast 10

9:10 36 60 15 23 170 overcast 10

8:50 36 60 7 140

mostly 

cloudy 10

8:30 34 64 9 110

partly 

cloudy 10

8:10 32 74 0

mostly 

cloudy 10

7:50 32 80 5 80

partly 

cloudy 10

7:30 32 80 3 130

partly 

cloudy 10

7:10 32 80 5 180 clear 10

6:50 32 80 7 200 clear 10

6:30 34 64 12 18 230

partly 

cloudy 10

6:10 34 64 7 250

mostly 

cloudy 10

5:50 36 60 13 23 230

mostly 

cloudy 10

5:30 34 69 7 17 240

mostly 

cloudy 10

5:10 34 75 6 22 220 overcast 10

4:50 32 93 5 120 overcast 10

4:30 32 93 3 80 overcast 10

4:10 32 93 0 lt snow 10

3:50 32 93 3 60 lt snow 1.75

3:30 32 93 5 18 330

mod 

snow 0.75

3:10 32 86 8 280

mod 

snow 4

2:50 32 80 6 360 overcast 10

2:30 32 86 0 overcast 10

2:10 32 86 5 90 lt snow 10

1:50 32 86 8 120 overcast 10

1:30 32 86 8 80 overcast 10

1:10 32 86 5 40 lt snow 7

0:50 32 93 7 90 lt snow 1.75

0:30 32 86 13 16 120 lt snow 3

0:10 32 93 0 lt snow 4
44

Table 10. Wind and weather observations for Pagosa Springs, Colorado, reported by the 

University of Utah MesoWest site (http://www.met.utah.edu/mesowest/) for April 3, 2009. Speeds 

at or above the blowing dust thresholds (caused by or reduced by dust) have been highlighted in 

yellow. No visual weather records are made for this site.

Time in 

MDT 

(April 3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in mph

Wind 

Gust 

in mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

0:00 32 91 12 25 230

23:45 33 88 1 5 140

23:30 33 87 2 8 95

23:00 35 76 6 19 210

22:30 41 39 9 24 215

22:15 41 37 19 37 250

22:00 44 32 7 24 250

21:45 44 31 12 21 250

21:30 46 28 9 23 265

21:15 47 27 11 24 225

21:00 48 27 12 31 220

20:45 48 27 5 23 190

20:30 49 26 13 27 160

20:15 50 26 6 17 190

20:00 50 26 7 24 195

19:45 50 26 9 16 210

19:30 51 26 12 29 180

19:15 51 26 14 29 200

19:00 51 27 16 25 155

18:45 50 27 14 34 205

18:30 50 27 13 32 210

18:15 52 26 14 29 220

18:00 53 26 16 33 230

17:45 52 27 14 26 255

17:30 51 28 22 41 200

17:15 52 28 14 35 235

17:00 51 29 11 24 175

16:45 52 29 12 29 190

16:30 53 29 10 21 190

16:15 52 29 12 23 205

16:00 50 30 10 27 265

15:45 52 29 12 24 195

15:30 52 29 12 23 145

15:15 51 30 11 26 230

15:00 50 32 7 19 215

14:45 49 33 7 22 260

14:30 49 33 9 30 210

14:15 51 32 9 26 180

14:00 50 30 7 23 235

13:45 51 30 9 24 200

13:30 50 30 7 26 200

13:15 51 30 14 32 200
45

Time in 

MDT 

(April 3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in mph

Wind 

Gust 

in mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

13:00 52 31 12 31 160

12:45 50 33 9 25 235

12:30 51 34 9 20 195

12:15 49 35 12 23 215

12:00 47 36 9 22 235

11:45 48 36 9 20 180

11:30 47 38 12 22 190

11:15 49 39 6 15 145

11:01 46 42 9 14 130

10:45 46 44 6 11 205

10:30 45 49 4 9 130

10:15 43 56 1 4 20

10:00 40 61 0 4 165

9:45 38 65 3 4 250

9:30 38 67 1 3 190

9:15 37 70 1 2 235

9:00 37 76 0 1 275

8:45 36 80 2 3 5

8:30 35 84 1 4 330

8:15 35 89 1 2 30

8:00 33 91 0 1 270

7:45 32 91 0 1 270

7:30 32 91 2 4 280

7:15 31 90 2 4 285

7:00 32 90 2 3 280

6:45 32 89 2 5 285

6:30 32 87 0 2 0

6:15 33 85 0 4 345

6:00 33 83 2 4 5

5:45 34 79 2 4 345

5:30 34 76 0 2 310

5:15 35 75 0 3 285

5:00 35 72 2 4 335

4:45 35 71 1 3 300

4:30 36 69 1 6 295

4:15 35 69 6 10 285

4:00 35 71 1 1 270

3:45 35 72 1 6 285

3:30 35 72 0 4 200

3:15 35 72 0 2 285

3:00 35 72 0 1 265

2:45 35 72 2 4 275

2:30 35 71 0 2 130

2:15 35 69 0 5 310

2:00 35 65 3 7 0

1:45 36 56 4 13 340
46

Time in 

MDT 

(April 3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in mph

Wind 

Gust 

in mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

1:30 39 46 3 14 290

1:15 38 44 1 7 105

1:00 37 43 0 4 295

0:45 37 44 1 2 180

0:30 36 44 2 4 310

0:15 36 44 2 3 15

Table 11. Wind and weather observations for Grand Junction, Colorado, reported by the 

University of Utah MesoWest site (http://www.met.utah.edu/mesowest/) for April 3, 2009. Speeds 

at or above the blowing dust thresholds, Weather, and Visibility (caused by or reduced by dust) 

have been highlighted in yellow.

Time in 

MDT 

(April 3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in mph

Wind 

Gust 

in mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

23:53 38 85 8 10 overcast 10

23:28 37 87 6 340 overcast 10

23:00 37 87 8 320 overcast 10

22:53 38 85 7 330 overcast 10

22:00 37 87 5 290 overcast 10

21:53 38 85 6 300 overcast 10

21:24 39 81 3 lt rain 10

20:53 39 86 9 310 lt rain 10

19:53 38 89 14 320 lt rain 10

19:45 37 87 15 310 lt rain 10

19:35 39 87 18 290 lt rain 7

19:27 39 87 16 25 310 lt rain 8

19:01 39 87 18 320 overcast 10

18:53 39 89 20 33 300 lt rain 10

18:12 48 71 3 220 overcast 10

17:53 49 71 8 240

mostly 

cloudy 10

17:21 50 62 7 60

mostly 

cloudy 10

17:07 48 66 3 340

mostly 

cloudy 10

16:53 50 66 8 10

partly 

cloudy 10

16:25 50 66 6 340

mostly 

cloudy 10

16:08 48 66 5

mostly 

cloudy 10

15:53 48 71 6 360 lt rain 10

14:53 47 71 7 290

mostly 

cloudy 10

14:48 46 71 7 280

mostly 

cloudy 10
47

Time in 

MDT 

(April 3)

Temperature 

Degrees F

Relative 

Humidity 

in %

Wind 

Speed 

in mph

Wind 

Gust 

in mph

Wind 

Direction 

in 

Degrees

Weather Visibility 

in miles 

14:34 48 71 8 290

mostly 

cloudy 10

13:53 45 74 3 60

partly 

cloudy 10

13:31 45 76 8 340

mostly 

cloudy 10

12:53 43 79 10 310

mostly 

cloudy 10

12:23 41 81 0 lt rain 10

11:53 40 86 3 40 lt rain 7

11:48 39 87 3 60 lt rain 7

11:05 39 87 7 10

lt rain, 

fog 4

10:53 39 89 8 360

mod rain, 

fog 2.5

10:45 39 87 8 10

mod rain, 

fog 4

9:53 39 86 6 340 mod rain 7

9:29 39 87 8 320

lt rain, 

fog 4

9:19 37 87 10 22 310

hvy rain, 

fog 2.5

8:53 43 82 9 10 lt rain 10

8:02 41 87 3 60 lt rain 7

7:55 41 87 0 hvy rain 7

7:53 41 87 0 hvy rain 8

6:53 43 82 14 220 lt rain 10

5:53 44 76 12 160 overcast 10

4:53 46 60 9 150 overcast 10

3:53 43 65 7 90

mostly 

cloudy 10

2:53 48 49 20 35 150 overcast 10

1:53 49 48 13 160 overcast 10

0:53 50 29 8 190

mostly 

cloudy 10
48

Table 12. Storm Reports for the National Weather Service Flagstaff Forecast Office on April 3, 

2009 (reported by Iowa State University Department of Agronomy 

http://mesonet.agron.iastate.edu/vtec/#2009-O-NEW-KGJT-HW-W-0002.)

Office Report 

Time County Location ST Event Type Mag. Source

Flagstaff

Fri Apr 03 

2009 

15:25:00 

GMT-8:25 

MST

Coconino 7 Wnw 

Winslow AZ

NONTSTM 

WND 

GST

68 public

Flagstaff

Fri Apr 03 

2009 

15:25:00 

GMT-8:25 

MST

Coconino 7 Wnw 

Winslow AZ

NONTSTM 

WND 

GST

68 public

Flagstaff

Fri Apr 03 

2009 

16:26:00

GMT-9:26 

MST

Navajo Winslow AZ

NONTSTM 

WND 

GST

69 asos

Flagstaff

Fri Apr 03 

2009 

17:05:00 

GMT10:05 

MST

Yavapai Prescott AZ

NONTSTM 

WND 

GST

60 asos

Flagstaff

Fri Apr 03 

2009 

17:55:00 

GMT10:55 

MST

Coconino Meteor 

Crater AZ

NONTSTM 

WND 

GST

91 public

Flagstaff

Fri Apr 03 

2009 

17:55:00 

GMT10:55 

MST

Coconino Meteor 

Crater AZ

NONTSTM 

WND 

GST

91 public

Flagstaff

Fri Apr 03 

2009 

17:55:00 

GMT10:55 

MST

Apache

Petrifed 

Forest N.P. 

He

AZ

NONTSTM 

WND 

GST

60 park/forest 

srvc

Flagstaff

Fri Apr 03 

2009 

18:39:00 

GMT11:39 

MST

Apache St. Johns AZ

NONTSTM 

WND 

GST

61 asos
49

Office Report 

Time County Location ST Event Type Mag. Source

Flagstaff

Fri Apr 03 

2009 

20:05:00 

GMT-0600 

13:05 

MST

Apache

Petrifed 

Forest N.P. 

He

AZ

NON-

TSTM 

WND 

GST

60 park/forest 

srvc

Flagstaff

Fri Apr 03 

2009 

20:05:00 

GMT-

13:05 

MST

Apache

Petrifed 

Forest N.P. 

He

AZ

NON-

TSTM 

WND 

GST

60 park/forest 

srvc

Flagstaff

Fri Apr 03 

2009 

20:50:00 

GMT-0600 

(Mountain 

Daylight 

Time)

Apache Sanders AZ

NON-

TSTM 

WND 

GST

68 public

Flagstaff

Fri Apr 03 

2009 

20:50:00 

GMT-

13:50 

MST

Apache Sanders AZ

NON-

TSTM 

WND 

GST

68 public

Flagstaff

Fri Apr 03 

2009 

22:15:00 

GMT-

15:15 

MST

Coconino Fraziers Well AZ

NON-

TSTM 

WND 

GST

58 mesonet

Flagstaff

Fri Apr 03 

2009 

22:18:00 

GMT-

15:18 

MST

Coconino Tuba City AZ

NON-

TSTM 

WND 

GST

61 mesonet

Flagstaff

Fri Apr 03 

2009 

23:14:00 

GMT-

16:14 

MST

Yavapai Seligman AZ

NON-

TSTM 

WND 

GST

71 awos

Flagstaff

Sat Apr 04 

2009 

00:44:00 

GMT-

17:44 

MST

Yavapai

2 Sse 

Milepost 340 

On H

AZ

NON-

TSTM 

WND 

GST

58 mesonet

Flagstaff

Sat Apr 04 

2009 

00:55:00 

GMT-

17:55 

MST

Navajo

1 Wnw

Milepost 310 

On S

AZ

NON-

TSTM 

WND 

GST

64 mesonet
50

Office Report 

Time County Location ST Event Type Mag. Source

Flagstaff

Sat Apr 04 

2009 

01:52:00 

GMT18:52 

MST

Coconino Doney Park AZ

NONTSTM 

WND 

GST

61 mesonet

Flagstaff

Sat Apr 04 

2009 

01:53:00 

GMT18:53 

MST

Yavapai 2 Se Bumble 

Bee AZ

NONTSTM 

WND 

GST

58 mesonet

Flagstaff

Sat Apr 04 

2009 

02:34:00 

GMT19:34 

MST

Apache Window 

Rock AZ

NONTSTM 

WND 

GST

66 asos

Flagstaff

Sat Apr 04 

2009 

03:50:00 

GMT20:50 

MST

Navajo Show Low AZ

NONTSTM 

WND 

GST

60 awos
51

3.0 Ambient Monitoring Data and Statistics

A PM10 concentration that exceeded the level of the twenty-four-hour NAAQS was monitored in 

Pagosa Springs, Colorado on Friday April 3, 2009. The exceedance of 225 μg/m3 was recorded at 

the Pagosa Springs Middle School monitoring site. This exceedance was caused by nature; a 

regional dust storm that was not preventable or reasonably controllable. The spatial extent of this 

dust storm was from the deserts of northern Arizona and northwestern New Mexico through the 

southern and central portions of Colorado (see Section 2). The brunt of this storm traveled 

through the south central portion of the Colorado Rocky Mountains hitting Pagosa Springs and 

Alamosa the hardest then traveled north to Mount Crested Butte and Breckenridge. This weather 

system adversely affected the air quality in Pagosa Springs and had a negative impact on PM10 

concentrations at several other monitoring stations in Colorado, including Alamosa-Municipal, 

Alamosa-Adams State College, Breckenridge, and Mount Crested Butte. Unfortunately, this was 

not a once every third-day scheduled sampling day; thus, the high PM10 was only captured by the 

daily monitoring sites, which make up less than one third of the PM10 network. See Figure 1 for a 

map of all the valid PM10 concentrations recorded in Colorado on April 3, 2009.

The 225 μg/m3at Pagosa Springs was the only site greater than the 24-hour PM10 NAAQS of 150 

μg/m3. Monitored PM10 levels before and after the April 3, 2009 episode were low as can be seen 

in Table 13 and Figure 31. The APCD reviewed PM10 monitoring data in Pagosa Springs and the 

surrounding areas in the path of the dust storm and statistically analyzed the Pagosa Springs data 

in section 3.1 below. The PM10 concentrations in Pagosa Springs on April 3, 2009 were compared 

to the concentrations on the day before and the day after the regional dust storm. Figure 31

showing PM10 data for the months of March and April 2009 and Figure 32 showing PM10 data for 

2009 in Pagosa Springs, clearly shows that the regional blowing dust storm adversely affected the 

air quality in Pagosa Springs on April 3, 2009. The days before and after the event were quite low 

with concentrations that are typical for winter in Pagosa Springs (see Table 13 and section 3.1, 

the Historical Fluctuations of PM10 Concentrations in Pagosa Springs). In the Pagosa Springs 

2009 time series graph, most of the days had PM10 concentrations well below 50 μg/m3, except 

for the four exceedances in March and April, which were all due to high wind blowing dust 

events similar to this one. 

Other PM10 monitoring sites in Colorado had elevated PM10 concentrations that were also above 

their typical seasonal and historical concentrations on April 3, 2009 as explained in Section 3.1 

below, but these sites did not exceed the 24-hour NAAQS. The remaining Colorado sites 

recorded concentrations between 28 - 32 μg/m3on April 3, 2009 (see map in Figure 1) at Denver 

area sites, which usually have low concentrations during these southwestern regional dust storm 

events, and 107 μg/m3at the Alamosa-Municipal Building site on April 3, 2009. Also, the 

Alamosa-Adams State College site was significantly elevated at 92 μg/m3. 

Table 13. Pagosa Springs PM10 Concentrations Before and After April 3, 2009 Regional Dust 

Storm.

Date Pagosa 

Springs

Alamosa 

Adams State 

College

Alamosa 

Municipal

Breckenridge Mount 

Crested 

Butte

4/02/2009 14 10 16 11 19

4/03/2009 225 92 107 79 80

4/03/2009 19 8 16 39 25
52

The April 3, 2009 regional dust storm had a large spatial extent covering most of northeast 

Arizona, northwest New Mexico, and it moved into southern and central mountains area of 

Colorado and was captured at the daily PM10 sites from Pagosa Springs to Breckenridge. Since 

only daily PM10 sites were operating on April 3, 2009 it is not possible to see many high PM10 

concentrations across the state. For example, Durango and Telluride were likely in the path of the 

dust storm but were not monitoring on April 3, 2009. A more robust network of PM10 monitors on 

a daily frequency would have shown more exceedances or elevated concentrations from this 

natural blowing dust event. Section 2 provides the meteorological evidence for the spatial extent 

of this regional blowing dust event including the dust on snow data from the Colorado Dust-onSnow (CODOS) network. The CODOS network clearly show that the spatial extent of this dust 

storm was quite large, covering thousands of square miles (see 

http://www.snowstudies.org/CODOS/Compiled%20WY%202010%20CODOS%20Updates.pdf).

There are also many weather stations across the path of the dust storm that recorded high winds, 

visibilities less than 10 miles, and haze, which is blowing dust when there is no precipitation 

present for that hour. Many of these weather stations are located in areas that do not have PM10 

monitoring sites. These meteorological stations can act as surrogates and help demonstrate the 

extent of the blowing dust in towns where there are no daily PM10 monitoring sites. See section 2 

for the full meteorological details and extent of the regional dust storm. 

Other data that shows the extent of the regional dust storm includes the Colorado Dust-on-Snow 

(CODOS) stations and news accounts and e-mails from credible eye witnesses. These sites record 

the date and other data when dust reached the high altitude monitoring stations (see Section 2 for 

details). April 3, 2009 was a dust on snow event according to the CODOS records 

(http://www.snowstudies.org/CODOS/CSAS%20Dust-on-Snow%20Log.pdf). 

The time series graph in Figure 31 shows the seasonal PM10 concentrations at the Pagosa Springs 

site during the months of March and April, 2009. The graph shows five regional blowing dust 

events that occurred that spring and impacted the town of Pagosa Springs. The PM10 

concentrations on the days before and after the April 3, 2009 blowing dust event were quite low 

and this chart shows that event to be concentrated on that single day in Pagosa Springs. The other 

blowing dust events in March and April showed similar results; low PM10 concentrations before 

and after the blowing dust days. The town of Pagosa Springs at 7,103 ft. (2165 m) is located in a 

mountain valley topographic setting surrounded by mostly coniferous forests. There are very few

anthropogenic local sources of geologic PM10 sized dust in the area as most of the area is covered 

in coniferous forest vegetation. Also, the anthropogenic sources are well controlled due to a State 

Implementation Plan (SIP) / PM10 Maintenance Plan. See section 5.0 Local Dust Controls for a 

comprehensive list of PM10 control measures employed in Pagosa Springs through the PM10 SIP / 

Maintenance Plan. 

From the limited PM10 data (daily sites only) on April 3, 2009 in Pagosa Springs, Alamosa, 

Breckenridge, and Mount Crested Butte before and after the high wind blowing dust event clearly 

shows that April 3, 2009 was a high PM10 event. Furthermore, the regional blowing dust event on 

that day caused a PM10 concentration that was much higher than normal for the two month 

(March and April) seasonal spring period of interest. Even though the PM10 data for Pagosa 

Springs during the months of March and April shows three additional PM10 exceedances, these 

were also caused by large naturally occurring regional blowing dust events that were not 

preventable or reasonably controllable. The March and April, 2009 period was exceptional in that 

it contains one of the most frequent regional blowing dust periods in the history of PM10 

monitoring in Colorado and was well documented by numerous sources. There were six regional 

blowing dust events in the two month period that covered large spatial areas of Colorado, Arizona 

and New Mexico that have been, or will be, documented by the CDPHE APCD in previous (see 

March 22, 2009 TSD) or future exceptional event technical support documents. 
53

The elevated PM10 concentrations in Alamosa at the Adams State College and Municipal Building 

sites of 92 μg/m3and 107 μg/m3, respectively and at Mount Crested Butte 80 μg/m3, and 

Breckenridge 79 μg/m3on April 3, 2009 provide additional direct evidence that the regional dust 

storm brought elevated PM10 concentrations to other areas in Colorado and affected air quality in 

those areas. There were no other PM10 exceedances recorded in the State because the PM10 daily 

monitoring network is sparse in this area of Colorado and dust storms do not have homogeneous 

deposition 

Figure 31. PM10 Seasonal Concentrations in Pagosa Springs March and April, 2009.

Figure 32 shows the annual PM10 data for 2009 in Pagosa Springs. There were at least six 

regional blowing dust events identified by the Division that adversely affected the air quality in 

Pagosa Springs in 2009. Four of those events caused PM10 24-hour exceedances in Pagosa 

Springs. Also, the data would support that PM10 is well controlled in Pagosa Springs. If it were 

not, there should be high PM10 spikes during the winter when temperature inversions are 

strongest, which is common in Colorado mountain valley regimes. Instead, high PM10

concentrations are only seen when winds are highest during regional dust storm events. All of 

these six dust storms originated in the Four Corners area from deserts in northern Arizona and 

northwest New Mexico. 

75

255

100

225

182 188

0

50

100

150

200

250

300

Concentration ug/m3

Pagosa Springs PM10 March & April, 2009

Pagosa Springs

April 3, 2009 Regional Blowing Dust Event

April 25, 2009 

Regional Blowing 

Dust Event

Suspected operator 

date error should be 

4/8/09 Regional 

Blowing Dust Event

March 22, 2009 Regional Blowing Dust Event

April 3, 2009 Regional Blowing Dust Event

April 25, 2009 

Regional Blowing 

Dust Event March 29, 2009 

Regional Blowing Dust 

Event

Suspected operator 

date error should be 

4/8/09 Regional 

March 5, 2009 Regional Blowing Dust Event

Blowing Dust Event
54

Figure 32. Pagosa Springs PM10 Time Series for 2009

Figure 33, the Alamosa PM10 time series graph for 2009, is shown to demonstrate how Alamosa 

was impacted by the dust storm on April 3, 2009 and to show the extent of the blowing dust. 

Even though Alamosa did not exceed the NAAQS on April 3, 2009, the PM10 concentrations 

were significantly elevated with values of 107 μg/m3at the Alamosa-Municipal site and 92 μg/m3

at the Alamosa-Adams State College site, respectively. 

75

255

100

225

182 188

0

50

100

150

200

250

300

Concentration ug/m3

Pagosa Springs PM10 2009

Pagosa Springs

Suspected operator date error should be 

4/8/09 Regional Blowing Dust Event

March 22, 2009 Regional Blowing Dust Event

April 3, 2009 Regional Blowing Dust Event

April 25, 2009 Regional Blowing Dust Event

March 29, 2009 

Regional Blowing 

Dust Event

March 5, 

2009 Eastern 

Colo. Reg. 

Dust Event
55

Figure 33. Alamosa PM10 Time Series for 2009

105

92

135

207

109 107

157

0

50

100

150

200

250

300

Concentration ug/m3

Alamosa PM10 2009

Alamosa - ASC Alamosa - Municipal

April 8, 2009 Blowing

Dust Event

April 3, 2009 Blowing

Dust Event

Oct 5, 2009 Blowing

Dust Event

March 5, 2009 Blowing

Dust Event (Lamar 

Exceedance)

Feb. 27, 2009 

Blowing Dust 

Event 

(Durango 

Exceedance)
56

Figure 34. Breckenridge PM10 Time Series for 2009

The 2009 PM10 data for Breckenridge does appear to show a seasonal bias. The concentrations 

are higher in the spring period. This is confirmed in the 2004 - 2009 time series graph in Figure 

35 which shows significant seasonality unlike other sites in the south, southwest, and southeast

Colorado. Breckenridge is an international resort ski town. The elevated PM10 emissions are 

probably due to paved street emissions in the winter and spring when the roads dry out. Also, 

there is a lack of PM10 control measures for street emissions in Breckenridge since there is no SIP 

or MOU in place. However, Breckenridge has banned residential wood burning for all but a few 

grandfathered woodstoves. The PM10 concentrations are not high enough to warrant a SIP or 

MOU. There has only been one exceedance recorded of the NAAQS in Breckenridge from 2004 

– 2009, at a concentration of 170 μg/m3on May 19, 2005. The PM10 concentration of 79 μg/m3on 

April 3, 2009 is the second highest concentration in 2009 and the sixteenth highest in the 2004 –

2009 dataset (n= 1785 samples). The second, third and fourth highest concentrations are only 

110 μg/m3, 105 μg/m3, and 104 μg/m3, respectively. 

79

101

74

0

50

100

150

200

Concentration ug/m3

Breckenridge PM10 2009

Breckenridge

April 8, 2009 Blowing Dust Event

April 3, 2009 Blowing 

Dust Event April 25, 2009 Blowing Dust Event
57

Figure 35. Breckenridge PM10 Time Series for 2004 - 2009

Mount Crested Butte is located 112 miles (182 km) north of Pagosa Springs with very complex 

terrain (13,000 – 14,000 foot peaks) between the two towns. Mount Crested Butte is a ski area 

town and the PM10 monitor is located at an elevation of 9,403 feet (2,866 m). CDPHE has a 

Memorandum of Agreement (MOA) in Mount Crested Butte to control dust from roads and other 

anthropogenic sources in the town. Furthermore, the Mount Crested Butte area was snow covered 

on March 22, 2009. The major sources of PM10 in Crested Butte: re-entrained dust from local 

streets (there are no major streets or highways in town) and residential wood burning. The largest 

contributor is re-entrained dust and the street dust was likely well controlled due to the controls in 

the MOA (using more durable sand and magnesium chloride to reduce dust on parking lots, more 

frequent street sweeping, and a construction ordinance to reduce mud and dirt carry-out on 

streets). (Reference: Mount Crested Butte, Memorandum of Agreement, Effective March 5, 

1998.)

Figure 36 shows that PM10 concentrations in Mount Crested Butte for 2009 are much lower than 

the other impacted sites. Most days are well below 50 μg/m3and there are no concentrations 

above 100 μg/m3. However, four of the 2009 blowing dust events significantly impacted air 

quality in Mount Crested Butte and the April 3, 2009 concentration was 80 μg/m3, which was the 

second highest concentration in 2009 and the 98.9th percentile concentration for 2005 – 2009 (see 

Table 15).

110 105

170

104 101

0

50

100

150

200

1/1/04 1/1/05 1/1/06 1/1/07 1/1/08 1/1/09

Concentration ug/m3

Breckenridge PM10 2004 - 2009

Breckenridge
58

Figure36. Mount Crested Butte PM10 Time Series for 2009. 

The six-year time-series graph in Figure 37 below shows that PM10 in Pagosa Springs sometimes 

has high concentrations in the winter to early summer period (Jan. to June). Statistically, 

however, there is little seasonal variation or month-to-month variation as discussed below. Most 

of the concentrations above are below 50 ug/m3and there are just three excursions between 100 –

150 ug/m3. There were four PM10 exceedance in the spring of 2009. This was a very unusual dry 

period with several high wind blowing dust storms in the region. The four exceedances occurred 

on March 22, 2009, April 2, 2009, April 8, 2009, and April 25, 2009. The APCD has submitted a 

technical support document (TSD) for the March 22, 2009 Pagosa Springs Exceptional Event to 

EPA. This TSD provided ample evidence to support this exceedance as a natural high wind 

blowing dust event. The APCD plans to submit TSD’s for the other exceedances in 2009 along 

with this April 3, 2009 exceedance as there is also ample evidence to support these PM10

exceedances as being caused by natural high wind blowing dust events. 

Also, in this five-year period were three events that were elevated above 100 μg/m3and were 

caused by natural high wind events that are worth mentioning here. A near-exceedance of 149 

ug/m3 occurred on May 1, 2008, but that date was not documented as an exceptional event by the 

APCD as it was not an exceedance of the 24-hour PM10 NAAQS. However, there is a high 

probability that the 149 ug/m3 was an exceptional event due to high winds and blowing dust. 

There is also ample weather data to demonstrate that May 1, 2008 had sustained wind speeds 

above the blowing dust threshold of greater than 25 mph (see

http://mesowest.utah.edu/index.html). The other two concentrations greater than 100 ug/m3 (122 

ug/m3 on February 15, 2006 and 102 ug/m3 on June 6, 2007) were also associated with high 

regional sustained winds above the blowing dust threshold of 25 mph and gusts of much higher 

winds also occurred on the high wind days. Both of these dates are recorded in the Colorado 

93

81 80

56

0

50

100

150

200

250

300

Concentration ug/m3

Mt. Crested Butte PM10 2009

Mt. Crested Butte

March 22, 2009 Regional Blowing Dust Event

March 29, 2009 Regional Blowing Dust Event

April 3, 2009 Regional Blowing Dust Event

April 8, 2009 Regional Blowing Dust Event
59

Dust-on-Snow Deposition Events Log (see Table 13) as regional blowing dust events that brought 

windblown dust to snow covered areas near high mountain passes in Colorado, where there are 

little or no local anthropogenic sources of PM10. Furthermore, the February 15, 2006 event was a 

documented exceptional event that caused an exceedance in Alamosa and Grand Junction, which 

are east and north of Pagosa Springs, respectively (see exceptional event Technical Support 

Documentation for Alamosa on 2/15/06.) 

Figure37. Pagosa Springs PM10 Six Year Time Series

The monitoring data above shows the spatial extent and magnitude of impact of the regional 

blowing dust storm that impacted Alamosa and other Colorado towns. Section 3.1 below will 

discuss the historical fluctuations of PM10 in Alamosa and provide statistical analyses to 

demonstrate the magnitude and the seasonality of the April 3, 2009 dust storm. It will also 

provide a “but for” test using typical concentrations versus the exceptional event due to the 

regional dust storm to estimate the impact that was due to the regional dust storm. 

3.1 Historical Fluctuations of PM10 Concentrations Pagosa Springs

This historical fluctuation evaluation of PM10 monitoring data for sites affected by the April 3, 

2009 event was made using valid samples from PM10 samplers In Pagosa Springs. APCD has 

monitored PM10 in Pagosa Springs at two different sites (080070001 and 080070002) at various 

frequencies and intervals beginning in 1985. However, it’s only been since 1992 that monitoring 

was performed with a consistent frequency (daily) and with sufficient completeness (> 75%) to 

satisfy data requirements for this analysis. Therefore, the data in this analysis is from both sites 

beginning January 1992 through the end of 2009. The sites are spatially situated so that concerns 

122

102

149

255

225

182

188

0

50

100

150

200

250

300

01/01/04 01/01/05 01/01/06 01/01/07 01/01/08 01/01/09

Concentration ug/m3

Pagosa Springs PM10 2004 - 2009

Pagosa Springs

2/15/06 Event

6/6/07 Event

5/1/08 Event

4/6/09 Event*

4/25/09 Event

4/3/09 Event

3/22/09 Event

Site down for re-roofing

* Sample Actually Taken 4/8/09
60

regarding comparability between sites are minimal. There was no time period when data was 

taken concurrently at both sites; however the data from each data set reflects a similar 

distribution. This period includes a five-month interval from mid May 2005 through early 

October 2005 when the site was down for roof construction activities. The overall data summary 

and a time series plot for data from 2005 to 2009 are presented in Figure 38, with all data values 

being presented in μg/m3

Table 14. Pagosa Springs PM10 Monitoring Data Summary

Summary 1992 - 2009

Pagosa Springs

Count 6096

Min 3

1 Q 18

Median 24

3 Q 36

Max 262

Mean 28.6

SD 17.6

Date Range 1992 - 2009

04/03/2009 225

Figure 38. Five Year Time-Series Graph of PM10 in Pagosa Springs

255, 22 Mar 2009

225, 03 Apr 2009

182, 06 Apr 2009*

188, 25 Apr 2009

0

50

100

150

200

250

300

Jan-05 Jul-05 Jan-06 Jul-06 Dec-06 Jul-07 Dec-07 Jun-08 Dec-08 Jun-09 Dec-09

Pagosa Springs PM10

2005 - 2009

*Sample actually taken 08 Apr 2009
61

The spatial scope of this event was state-wide and had an impact on PM10 concentration at 

multiple sites. A snapshot of data from those sites affected by the event is presented here, along 

with the approximate percentile value that data point represents for each site for their unique 

historical data sets, for the month of the event (every sample in any April), and for the year.

Table 15. Percentile Values for April 3, 2009 PM10 Concentrations

Evaluation

Alamosa 

ASC

Alamosa 

Municipal

Mt. Crested 

Butte Breckenridge

03-Apr-09 92 μg/m3

107 μg/m380 μg/m379 μg/m3

Overall 99.0% 99.2% 98.9% 98.9%

All April 96.8% 95.4% 99.0% 98.3%

2009 98.8% 99.4% 99.4% 99.7%

Additionally, the Pagosa Springs data set was summarized by month and year. These summaries 

present no obvious ‘season’; PM10 levels at any particular site in Colorado do not necessarily 

fluctuate by season. Of greater importance affecting day-to-day, typical PM10 concentrations are 

local sources, e.g. road sanding and sweeping, local burning from agriculture and residential 

heating, vehicle contributions via road dust, unpaved lots or roads, etc. While the historic 

monthly median values for Pagosa Springs are higher during the winter and spring months than 

the rest of the year there is little month-to-month variation. This time frame (winter and early 

spring) is that which is most likely to experience the meteorological and dry conditions exhibited 

during this event and discussed elsewhere in this document. The lack of variability between 

monthly medians suggests that typical data exhibiting regular variation due to local sources are 

those in the inner-quartile range (i.e. between the 75th and 25th percentile). If a conservative 

approach is taken then a typical value should be no higher than the historic monthly 75th

percentile value. The summary data for the month of April (all samples in any April) and for 

2009 is presented in Table 16:

Table 16. Month and Year PM10 Monitoring Data Summary

Pagosa Springs April 2009

Count 511 354

Min 3 6

1 Q 20 16

Median 27 20

3 Q 37 26

Max 225 255

Mean 31.1 24.9

sd 20.2 23.4

Pagosa Springs – 080070001 and 080070002

The PM10 sample on 03-April, 2009, at Pagosa Springs of 225 μg/m3is greater than the 99th 

percentile value (87 μg/m3) for all April data, is greater than the 99th percentile value (138 μg/m3) 

for all 2009 data, and is greater than the 99th percentile value (56 μg/m3) for the entire dataset. 

Overall, this sample is the fourth highest sample in the entire data set, the second highest sample 

in 2009, and the maximum sample in any April. The three samples in the entire data set greater 

than the event sample are 262 μg/m3(12/29/94), 262 μg/m3(12/21/1994), and 255 μg/m3

(03/22/2009); all three samples are associated with high wind events. There are 6096 samples in 
62

this dataset. The sample of April 3, 2009 clearly exceeds the typical samples for this site and sits 

well beyond the normal distribution.

The following plots graphically characterize the Durango PM10 data. The first plot is the overall 

frequency histogram. The histogram displays a well-formed density function, almost 80% of the 

samples values are less than 40 μg/m3and over 90% of the samples are less than 50 μg/m3.

Figure 39. Histogram of PM10 Data in Pagosa Springs (1992 – 2009)

The monthly box-whisker plot, below, highlights the consistency of the majority of data from 

month to month. Note the greater variability (wider inner-quartile range) and greater range of the 

data through the winter and early spring months that’s accompanied by typically greater monthly 

maxima. Recall, this time period experiences a greater number of days with meteorological 

conditions similar to those experienced on April 3, 2009. Although these high values affect the 

variability and central tendency of the dataset they are not representative of what is typical at the 

site. 

0.00%

20.00%

40.00%

60.00%

80.00%

100.00%

120.00%

0

200

400

600

800

1000

1200

1400

1600

1800

2000

Frequency

Concentration (mg/m3)

Pagosa Springs PM10 Histogram

Frequency

Cumulative %
63

Figure 40. Monthly Pagosa Springs PM10 Box and Whisker Plot (1992 – 2009)

The box in whisker plots graphically represent the overall distribution of each data set including 

the median ( ), the inner quartile range ( IQR, defined to be the distance between the 75th% 

and 25th%), the mean (represented by the horizontal black line) and two types of outliers identifed 

in these plots: outliers greater than 75% +1.5*IQR ( )and outliers greater than 3Q + 3*IQR ( 

). The outliers that satisfy the last criteria are labeled with sample value and sample date for 

those samples greater than 150 μg/m3. Each of these outliers is associated with a known highwind event similar to that of 03-April. One sample, April 6, 2009, is believed to have been 

mislabeled by the operator; APCD believes the sample was actually taken on the April 8, 2009 –

corresponding to another high wind event.

The box plot of annual summaries may point to a trend of decreasing sample values, but without a 

similar decrease in the number of outliers. In 2009 there were more samples greater than 150 

mg/m3 than in any other year yet the variation in the data as measured by the IQR is less than that 

for any year except 2006. Each of these samples from 2009 is associated with an event similar to 

the one discussed in this document.

255, 22 Mar 2009

225, 03 Apr 2009

188, 25 Apr 2009

182, 06 Apr 2009 165, 12 Jun 2000

262, 29 Dec 1994

258, 21 Dec 1994

225

0

50

100

150

200

250

300

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
64

Figure 41. Annual Pagosa Springs PM10 Box and Whisker Plot (1992 – 2009)

No Exceedance But For the Event

An estimation of PM10 due to the event is presented here. Based on the entirety of data in the 

Historical Summary (including multiple high wind events), a conservative estimate of the 

‘typical’ values in March for Pagosa Springs would have been between 37 and 43 μg/m3

corresponding to the 75th and 84th Percentile values. Using these conservative values as a range 

to estimate typical local contributions would indicate that the event provided an additional 

contribution of 182 – 188 μg/m3. Clearly, there would have been no exceedance but for the 

additional contribution provided by the event.

Table 17. No Exceedance But For the Event Test

Est. Conc. 

Above 

Typical 

(μg/m3

Site )

Event Day

Concentration 

(μg/m3)

April 

Median 

(μg/m3)

April 

Average 

(μg/m3)

April 75th

% (μg/m3)

April 84th

% (μg/m3)

Pagosa Springs 225 31 31.1 37 43 182 - 188

3.2 Monitoring Data and Conclusions

Since the local anthropogenic sources are well controlled in Pagosa Springs and the surrounding 

area is covered by trees and other vegetation, and since the sustained surface wind speeds were 

well above 25 mph in the region of the dust storm, it follows that the dust was transported into 

Pagosa Springs on April 3, 2009. This high wind blowing dust event affected the air quality in 

Pagosa Springs and several other locations, including but not limited to Alamosa, Breckenridge, 

Mount Crested Butte in the state of Colorado on April 3, 2009. The size, extent, and origination 

of the blowing dust storm made the event not preventable and it could not be reasonably 

controlled. Statistical data in section 3.1 clearly shows that but for this high wind blowing dust 

event Pagosa Springs would not have exceeded the 24-hour NAAQS on April 3, 2009. 

262, 29 Dec

258, 21 Dec

165, 12 Jun

255, 22 Mar

225, 03 Apr

188, 25 Apr

182, 06 Apr

0

50

100

150

200

250

300

1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
65

4.0 News Accounts and Credible Evidence
66

Dust Storm in Northeastern Arizona

Posted April 11, 2009

download large image (589 KB, JPEG) acquired April 3, 2009

This image is a favorite! Vote for your favorite image now. 

A dust storm struck northeastern Arizona on April 3, 2009. With winds over 145 kilometers (90 miles) 

per hour reported near Meteor Crater, east of Flagstaff, the storm reduced visibility and forced the 

temporary closure of part of Interstate 40, according to The Arizona Republic.

The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured this 

image on April 3, 2009. Clear skies allow a view of multiple source points of this dust storm. The source 

points occur along an arc that runs from northwest to southeast.

This dust storm occurred in the area known as Arizona’s Painted Desert, and the dust plumes show why. 

Whereas many dust plumes are uniform in color, these plumes resemble a band of multicolored ribbons, 

ranging from pale beige to red-brown, reflecting the varied soils from which the plumes arise. The 

landscapes of the Painted Desert are comprised mostly of Chinle Formation rocks—remains of 

sediments laid down during the time of the first dinosaurs, over 200 million years ago.

1. References

2. Engelbart, D. (2009, April 3). I-40 near Flagstaff reopened after winds cut visibility. The Arizona Republic. Accessed April 6, 2009. 

3. U.S. National Park Service. (2009, March 17). Petrified Forest National Park. Accessed April 10, 2009. 

NASA image by Jeff Schmaltz, MODIS Rapid Response Team, Goddard Space Flight Center. Caption by Michon Scott.
67

Press Release 09-133

Desert Dust Alters Ecology of Colorado 

Alpine Meadows

Accelerated snowmelt, prompted by dust, changes how plants respond to seasonal climate cues

More dust covers snow in the San Juan Mountains of Colorado than 

previously documented.

Credit and Larger Version

June 29, 2009

Accelerated snowmelt--precipitated by desert dust blowing into the mountains--changes how alpine plants respond to 

seasonal climate cues that regulate their life cycles, according to results of a new study reported this week in the 

journal Proceedings of the National Academy of Sciences (PNAS). These results indicate that global warming may have a 

greater influence on plants' annual growth cycles than previously thought.

Current mountain dust levels are five times greater than they were before the mid-19th century, due in large part to 

increased human activity in deserts.

"Human use of desert landscapes is linked to the life cycles of mountain plants, and changes the environmental cues that 

determine when alpine meadows will be in bloom, possibly increasing plants' sensitivity to global warming," said Jay Fein, 

program director in the National Science Foundation (NSF)'s Division of Atmospheric Sciences, which funded the research 

in part.

This year, 12 dust storms have painted the mountain snowpack red and advanced the retreat of snow cover, likely by 

more than a month across Colorado.

"Desert dust is synchronizing plant growth and flowering across the alpine zone," said Heidi Steltzer, a Colorado State

University scientist who led the study. "Synchronized growth was unexpected, and may have adverse effects on plants, 

water quality and wildlife."

"It's striking how different the landscape looks as result of this desert-and-mountain interaction," said Chris Landry, 

director of the Center for Snow and Avalanche Studies (CSAS) in Silverton, Colo., who, along with Tom Painter, director 

of the Snow Optics Laboratory at the University of Utah, contributed to the study.

"Visitors to the mountains arriving in late June will see little remaining snow," said Landry, "even though snow cover was 

extensive and deep in April. The snow that remains will be barely distinguishable from the surrounding soils.
68

Earlier snowmelt by desert dust, said Painter, "depletes the natural water reservoirs of mountain snowpacks and in turn 

affects the delivery of water to urban and agricultural areas."

With climate change, warming and drying of the desert southwest are likely to result in even greater dust accumulation in 

the mountains.

In an alpine basin in the San Juan Mountains, the researchers simulated dust effects on snowmelt in experimental plots. 

They measured dust's acceleration of snowmelt on the life cycles of alpine plants.

The timing of snowmelt signals to mountain plants that it's time to start growing and flowering. When dust causes early 

snowmelt, plant growth does not necessarily begin soon after the snow is gone.

Instead, plants delay their life cycle until air temperatures have warmed consistently above freezing.

"Climate warming could therefore have a great effect on the timing of growth and flowering," said Steltzer.

Competition for water and nutrient resources among plants should increase, leading to the loss of less competitive 

species. Delayed plant growth could increase nutrient losses, decreasing water quality.

Similarity in flowering times and plant growth will result in abundant resources for wildlife for a short time rather than 

staggered resources over the whole summer, Steltzer believes.

"With increasing dust deposition from drying and warming in the deserts," she said, "the composition of alpine meadows 

could change as some species increase in abundance, while others are lost, possibly forever."

-NSF-
69

5.0 Local Dust Control Measures

The following control measures resulted in the area’s attainment of the PM10 NAAQS, and these 

measures should ensure continued maintenance of the PM10 NAAQS through the year 2021, 

which is the duration of the maintenance period.

1. Control of Emissions through Road Paving

The Town of Pagosa Springs paved 6.5 miles of unpaved roads during 1992, 1993, and 1994 in 

order to reduce PM10 emissions. This strategy was adopted locally in 1991 and included in State 

regulation in 1992 (Section I.B. of the “State Implementation Plan-Specific Regulations for 

Nonattainment - Attainment/Maintenance Areas (Local Elements)). The rule was approved by 

EPA in 1994 and was removed from the Colorado regulation in 2000 as the paving requirements 

had been completed.

2. Street Sanding Controls

There is a requirement that any user that applies street sanding material on Highway 160 and 

Highway 84 in the Pagosa Springs attainment/maintenance area must use materials containing 

less than one percent fines. Users of street sand on these highways must also use 15 percent less 

sand than an established base sanding amount. These strategies were adopted in 1992 and 

approved by EPA in 1994, and they are defined in detail in Sections I.B. and C., respectively, of 

the “State Implementation Plan-Specific Regulations for Nonattainment -

Attainment/Maintenance Areas (Local Elements) Regulations (5 CCR 1001-20).

3. Control of Emissions from Stationary Sources

Although there are no stationary sources located in the Pagosa Springs attainment/maintenance 

area, the State’s comprehensive permit rules will limit emissions from any new source that may, 

in the future, locate in the area. These rules include: 1) under Colorado Air Quality Control 

Commission’s (AQCC) Regulation No. 3, "Air Pollution Emission Notices, Construction Permits 

and Fees, Operating Permits, and Including the Prevention of Significant Deterioration," 2) the 

“Common Provisions" regulation, and 3) AQCC Regulation No. 6, “Standards of Performance for 

New Stationary Sources.”

The Common Provisions, and Parts A and B of Regulation No. 3, are already included in the 

approved SIP. AQCC Regulation No. 6 implements the federal standards of performance for new 

stationary sources. The maintenance plan makes no changes to these regulations. This reference 

to Regulation No. 6 shall not be construed to mean that this regulation is included in the SIP.

As indicated above, emissions from new or modified major stationary sources emissions of PM10

are controlled under AQCC Regulation No. 3's nonattainment-area (NAA) new source review 

(NSR) permitting requirements. The NSR provisions require all new and modified major 

stationary sources to apply emission control equipment that achieves the "lowest achievable 

emission rate" (LAER) and to obtain emission offsets from other stationary sources of PM10.

The EPA approval of the original PM10 Maintenance Plan, effective on 08/14/01, reinstates the 

prevention of significant deterioration (PSD) permitting requirements in the Pagosa Springs 

Attainment/Maintenance area. The federal PSD requirements are considered a relaxation from 

the NAA NSR requirements, as LAER is no longer required and is replaced by the less stringent 

"best available control technology" (BACT), along with the removal of the requirement to offset 

PM10 emissions. The future reapplication of NAA NSR provisions appears unlikely in the 

Pagosa Springs Attainment/Maintenance area based on current PM10 monitoring trends.
70

4. Federal Motor Vehicle Emission Control Program

The federal motor vehicle emission control program has reduced PM10 emissions through a 

continuing process of requiring diesel engine manufacturers to produce new vehicles that meet 

tighter and tighter emission standards. As older, higher emitting diesel vehicles are replaced with 

newer vehicles; the PM10 emissions in the Pagosa Springs area will be reduced.

5. Voluntary and State-Only Measures

In addition to the mandatory control measures discussed above, there are other activities that 

result in the reduction of PM10 emissions that are not classified as “federally enforceable control 

measures.” Some notable examples include:

The Town of Pagosa Springs has historically cleaned Highway 160 in town throughout the winter 

and spring using regenerative air vacuum sweepers. The frequency of this voluntary 

sweeping/cleaning has been about once after each street sanding deployment. For the future, the 

Town of Pagosa Springs has committed to regularly vacuum sweep/clean Highway 160 within 

four days of the roadway becoming free and clear of snow and ice following each street sanding 

deployment, as weather, temperature, and street conditions permit, between the intersections of 

Highway 84 to the east and 14th street to the west.

The Town of Pagosa Springs requires that all new developments have paved streets.

The Town of Pagosa Springs encourages private businesses to properly clean/sweep private 

parking lots on a regular basis.

Archuleta County has completed the road paving (100% of total segment) of Hot Springs 

Boulevard.

Any owner or operator responsible for the construction or maintenance of any existing or new 

unpaved roadway which has vehicle traffic exceeding 200 vehicles per day in the 

attainment/maintenance area and surrounding areas must stabilize the roadway in order to 

minimize fugitive dust emissions. These State-wide requirements are defined in detail in Section 

III.D.2.a.(I) of the AQCC’s Regulation No. 1.

These strategies are considered to be voluntary local initiatives and State-only requirements, and 

are intended to reduce PM10 emissions. These strategies are not intended to be federally 

enforceable.
71

6.0 Laboratory and Field Data
72

7.0 Summary and Conclusions

Elevated 24-hour PM10 concentrations were recorded across Colorado on April 3, 2009. All of 

the noted April 3 twenty-four-hour PM10 concentrations were above the 95th percentile 

concentrations for their locations. The Pagosa Springs concentration is greater than the 99th

percentile, and a conservative estimate of the dust storm contribution to the total concentration is 

182 – 188 μg/m3. This is evidence that the event was associated with a measured concentration in 

excess of normal historical fluctuations including background. But for the dust storm to be 

described in detail in this report, there would have been no exceedance on this day in Pagosa 

Springs. 

This exceedance was the consequence of strong gusty winds ahead of a deep low pressure with a 

trailing cold front, in combination with dry conditions, which caused significant blowing dust 

across parts of Arizona, New Mexico, and Colorado. These winds were partly the result of a 

developing low pressure centered over southwestern Utah with a cold front trailing to the south as 

well as a second low pressure system over south-central Wyoming. These low pressures merged 

and centered over Colorado on April 3. Surface weather analyses show an area of low pressure 

affecting the Four Corners region. Winds in the dust source regions of northeast Arizona and in 

Flagstaff, Arizona were 74 mph on April 3, 2009. Surface winds of 20 to 54 mph with gusts of 25 

to 91 mph were recorded across the Four Corners region on April 3, 2009. These speeds are 

above the thresholds for blowing dust identified in EPA draft guidance and in detailed analyses 

completed by the State of Colorado. 

Climatological data for March and April shows that most of the Four Corners area had received 

less than normal precipitation for the period of interest. Soils in many areas of the Four Corners 

region had below normal moisture, and northeast Arizona was abnormally dry. Winslow in 

northeastern Arizona received only 0.05 inches of precipitation during the 30 days prior to April 

8, 2009. This total is well below the approximate threshold for blowing dust conditions at Hopi 

identified in the analysis contained in Attachment A. Both wind speeds and soil moisture in the 

Four Corners area and northeastern Arizona were conducive to the generation of significant 

blowing dust.

Friction velocities calculated for the region also help to explain why blowing dust originated in 

the Four Corners region. Even undisturbed desert soils normally resistant to wind erosion will be 

susceptible to blowing dust when friction velocities are greater than about 1.0 to 2.0 meters per 

second. High values above 2.0 meters per second were present within the Little Colorado River 

Valley and Painted Desert region of northeast Arizona where satellite imagery shows the eruption 

of large plumes of blowing dust. Note that blowing dust will typically only occur where these 

values are high and the soils are dry and not protected by vegetation, forest cover, boulders, 

rocks, etc. This is why blowing dust occurred in the desert and more arid areas of northeast 

Arizona and northwest New Mexico on April 3, 2009. The high friction velocities and the data 

on soil moisture conditions presented elsewhere in this report prove that this dust storm was a 

natural event that was not reasonably controllable or preventable.

Satellite imagery shows large plumes of southwest to northeast trending blowing dust in the 

Painted Desert and Little Colorado River Valley region of northeastern Arizona on April 3, 2009. 

Satellite imagery also shows this dust moving across the Four Corners into southwest Colorado. 

Backward trajectories, wind streamline analyses, and surface and upper-level wind patterns show 

that this dust would have been transported into Colorado on April 3, 2009. Multiple sources of 

data and analyses of past dust storms in this area prove that this was a natural event and, more 

specifically, a significant natural dust storm originating in northeastern Arizona and 
73

northwestern New Mexico. But for the dust storm on April 3, 2009, this exceedance would not 

have occurred.

The Center for Snow and Avalanche Studies (http://www.snowstudies.org/index.html) has been 

studying the effects of desert dust deposition on snowpack albedo and snowmelt in the San Juan 

Mountains of Colorado. The center’s log of events lists April 3, 2009, as one of twelve Dust-onSnow events for the 2008/2009 water year. Web cam photos from the Shamrock site in 

southwestern Colorado support the conclusion that widespread blowing dust was present on April 

8, 2009. NOAA’s Satellite Service Division also describes blowing dust moving from Arizona to

southwest Colorado on April 3, 2009. Multiple reports from professional experts at other 

institutions substantiate the conclusion that this was a natural event. But for the dust storm on 

April 3, 2009, this exceedance would not have occurred.
74

8.0 References

Colorado Department of Public Health and Environment, City of Lamar, Prowers County 

Commissioners, April 1998, Natural Events Action Plan for High Wind Events – Lamar, 

Colorado,

Draxler, R.R. and Rolph, G.D., 2012. HYSPLIT (HYbrid Single-Particle Lagrangian Integrated 

Trajectory) Model access via NOAA ARL READY Website 

(http://ready.arl.noaa.gov/HYSPLIT.php). NOAA Air Resources Laboratory, Silver Spring, MD.

Marticorena, B., G. Bergametti, D. Gillette, and J. Belnap, 1997, Factors controlling threshold 

friction velocity in semiarid and arid areas of the United States, Journal of Geophysical Research 

102 D19, 23,277-23, 287.

Streater, Scott, May14 2009, “Climate change, water shortages conspire to create 21st century 

Dust Bowl,” New York Times. (http://www.nytimes.com/gwire/2009/05/14/14greenwire-climatechange-water-shortages-conspire-to-cre-12208.html)

Technical Services Program, Air Pollution Control Division, Colorado Department of Public 

Health and Environment, November 22, 2011, Technical Support Document for the January 19, 

2009 Lamar Exceptional Event.

United States Environmental Protection Agency, May 2, 2011, draft Guidance on the Preparation 

of Demonstrations in Support of Requests to Exclude Ambient Air Quality Data Affected by High 

Winds under the Exceptional Events Rule.
75

Attachment A

Grand Junction, Colorado,

Blowing Dust Climatology

January 24, 2012

Technical Services Program

Air Pollution Control Division

Colorado Department of Public Health & Environment
76

A case can be made for the significant transport of regional blowing dust into Grand Junction 

from source regions in Utah and Arizona. While there are sources for wind-blown dust within the 

Grand Valley and Grand Junction itself, there is evidence from the analysis of soil features, wind 

and precipitation climatology, and statistical analyses of Grand Junction exceedances of the 

PM10 standard that regional sources often play a significant role during these blowing dust 

events. This document provides a weight of evidence analysis for dust transport into Colorado.

Grand Junction, Colorado, is located in a part of the country that is largely arid to semi-arid. 

Figure A-1 through A-3 show the annual average precipitation for Colorado, Arizona, and Utah, 

respectively. Grand Junction is in the Grand Valley of Western Colorado where the annual 

precipitation is typically less than 10 inches. Northeastern Arizona, which is frequently upwind 

of Grand Junction during blowing dust events, receives between 5 and 15 inches of precipitation 

each year. The Colorado River Basin in eastern and southeastern Utah, which is also frequently 

upwind of Grand Junction during blowing dust events, also receives 5 to 10 inches per year.

Figure A-4 shows the 1971-2000 monthly normal precipitation amounts for Grand Junction, 

Colorado. The annual average for this time period is 8.99 inches. The wettest months are March 

through May and August through October. The driest months are January, February, June, July, 

November, and December. These months receive an average of 0.57 inches per month. The 

annual monthly average precipitation is 0.75 inches.

Arid to semi-arid soils make much of the region susceptible to blowing dust. The map in Figure 

A-5 shows that portion of the Colorado Plateau (circled in red) where modern wind erosion 

features are common and clearly visible in Google Earth images. These features include 

longitudinal dunes and other sand or soil erosion structures with a predominant southwest to 

northeast orientation. This orientation is the result of the predominant southwesterly flow that 

occurs during high wind and blowing dust events in the region. Figures A-6 through A-12 

present aerial views of ubiquitous erosion features in northeastern Arizona and southeastern Utah. 

The Painted Desert of northeastern Arizona is frequently the source for much of the blowing dust 

in the Four Corners region. Figure A-13 provides a particularly good satellite image of a blowing 

dust event originating in the Painted Desert and extending northeastward across the junction of 

the Four Corners (source: NASA Tera satellite, http://earthobservatory.nasa.gov/IOTD/view.php?id=37791). 

Strong southwesterly winds caused this blowing dust event.

The text that accompanies this image on NASA’s Earth Observatory 10th Anniversary page 

follows below:

“A dust storm struck northeastern Arizona on April 3, 2009. With winds over 145 

kilometers (90 miles) per hour reported near Meteor Crater, east of Flagstaff, the storm

reduced visibility and forced the temporary closure of part of Interstate 40, according to 

The Arizona Republic.

The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra

satellite captured this image on April 3, 2009. Clear skies allow a view of multiple source 

points of this dust storm. The source points occur along an arc that runs from northwest 

to southeast.

This dust storm occurred in the area known as Arizona’s Painted Desert, and the dust 

plumes show why. Whereas many dust plumes are uniform in color, these plumes 

resemble a band of multicolored ribbons, ranging from pale beige to red-brown, 

reflecting the varied soils from which the plumes arise. The landscapes of the Painted 

Desert are comprised mostly of Chinle Formation rocks—remains of sediments laid 

down during the time of the first dinosaurs, over 200 million years ago.”
77

Figure A-1. Average annual precipitation in Colorado based on 1961-1990 normals.
78

Figure A-2. Average annual precipitation in Arizona based on 1961-1990 normals.
79

Figure A-3. Average annual precipitation in Utah based on 1961-1990 normals.
80

Figure A-4. 1971-2000 monthly normal precipitation in Grand Junction Colorado. 

Figure A-5. The portion of the Colorado Plateau in Utah, Arizona, and New Mexico that 

exhibits widespread surface soil and sand erosion features in Google Earth imagery. Much of the 

highlighted area within Arizona is within the Painted Desert.

0.00

0.25

0.50

0.75

1.00

1.25

1.50

1 2 3 4 5 6 7 8 9 10 11 12

Precipitation - Inches

Month

Grand Junction 1971-2000
81

Figure A-6. Southwest to northeast soil and sand erosion structures in southeastern Utah.

Figure A-7. Southwest to northeast soil and sand erosion structures in northeastern Arizona 

(Painted Desert).
82

Figure A-8. Southwest to northeast soil and sand erosion structures in southeastern Utah.

Figure A-9. Southwest to northeast soil and sand erosion structures in northeastern Arizona 

(Painted Desert). The slip faces of dunes (lighter bands) face in the direction of wind flow –

toward the northeast.
83

Figure A-10. Southwest to northeast soil and sand erosion structures in southeastern Utah.

Figure A-11. Southwest to northeast soil and sand erosion structures in northeastern Arizona 

(Painted Desert). 
84

Figure A-12. Southwest to northeast soil and sand erosion structures in northeastern Arizona 

(Painted Desert).
85

Figure A-13. NASA Tera satellite image of a dust storm on April 3, 2009, in southwesterly flow 

over the Painted Desert of northeastern Arizona (http://earthobservatory.nasa.gov/IOTD/view.php?id=37791). 
86

Figure A-14 displays the surface weather map for this event (00Z April 4, 2009, or 5 PM MST 

April 3, 2009). A strong low pressure system in southern Colorado, strong southwesterly winds 

in the Four Corners area, and the blowing dust symbol (infinity sign) at Farmington (New 

Mexico) and Cortez (Colorado) are evident in this map. Blowing dust in this region is frequently 

associated with southwesterly flow.

Figure A-14. Surface weather map for 00Z April 4, 2009, (5 PM MST April 3, 2009), showing a 

strong low pressure system in southern Colorado, strong southwesterly winds in the Four Corners 

area and the blowing dust symbol (infinity sign) at Farmington (New Mexico) and Cortez 

(Colorado).

A USGS map of the Colorado Plateau in Figure A-15 shows the prevalence of eolian or windblown sand deposits in southeastern Utah and northeastern Arizona. An analysis of the annual 

frequency of dust storms (Orgill and Sehmel, 1976) in the western half of the U.S. suggests that 

portions of eastern and western Utah and northeastern Arizona are source regions for blowing 

dust (see Figure A-16). Soil and sand structures point to the prevalence of southwesterly flow 

during blowing dust events, and precipitation climatology highlights the potential for blowing 

dust across much of the region. In addition, an analysis of back trajectories associated with high 

PM10 concentration events in Grand Junction discussed in the next section of this document 

supports the conclusion that soils in Arizona and Utah are likely significant contributors to PM10 

measured during many dust storms affecting Grand Junction.
87

Figure A-15. USGS map of eolian sand features on the Colorado Plateau 

(http://geochange.er.usgs.gov/sw/impacts/geology/sand/ ).
88

Figure A-16. Number of dust storms per year from: Orgill, M.M., Sehmel, G.A., 1976. 

Frequency and diurnal variation of dust storms in the contiguous USA. Atmospheric 

Environment 10, 813–825.

NOAA HYSPLIT 36-hour back trajectories were calculated for Grand Junction for the eight 24-

hour periods from 2004 through early 2009 with the Powell monitor PM10 concentrations in 

excess of 75 ug/m3, strong regional winds, and dry soils. Trajectories were modeled every 4 

hours for each day. Data presented later in this document provides evidence that the moderate to 

high PM10 levels on these days were from blowing dust. The 6 back trajectories for each day 

were calculated for an arrival height of 500 meters using EDAS40 data and model vertical 

velocities (see: http://www.arl.noaa.gov/HYSPLIT.php ). The eight days used in the analysis and 

the Powell monitor concentrations measured on these days are presented in Table A-1. 

The back trajectories for these high-concentration days are shown in Figure A-17. Transport was 

generally from the west through southwest. A high density of trajectory points is found in 

northeast Arizona and southeast Utah. Most of these trajectories in Figure A-17 are also 

consistent with transport from or across suspected or known blowing dust source regions 

highlighted in Figures A-5, A-13, A-15, and A-16.
89

Table A-1. Grand Junction Powell monitor days with concentrations in excess of 75 ug/m3 and 

blowing dust conditions (from 2004 through early 2009).

Year Month Day

Powell 24-hour PM10 

concentration in ug/m3

2005 4 19 197.8

2008 4 15 116.1

2008 4 21 103.6

2004 9 3 102

2006 3 3 98.3

2008 5 21 86.7

2008 4 30 83.5

2006 6 7 77.9

Figure A-17. NOAA HYSPLIT 36-hour back trajectories for Grand Junction for those eight 24-hour 

periods from 2004 through early 2009 with the Powell monitor PM10 concentrations in excess of 75 

ug/m3, strong regional winds, and dry soils. Trajectory points are sized and color-coded to reflect 24-

hour PM10 concentrations in ug/m3. Trajectories were calculated every 4 hours for each day. 

The trajectories in Figure A-17 point to the possibility that, at times, dust from Utah and Arizona can have 

a major impact on Grand Junction and less of an impact elsewhere in western Colorado. This nonhomogeneity is possible given the fact that dust storms are frequently organized into discreet plumes from 

discreet areas that maintain their integrity for long distances. An example of this can be seen in Figure A-
90

18 that shows plumes of dust in New Mexico during a windstorm on May 20, 2008.

Figure A-19 shows the NOAA HYSPLIT back trajectories for the highest concentration day during the 

2004 through early 2009 period: April 19, 2005. Twenty-four hour back trajectories for each hour during 

the period with high winds (using EDAS40 data and 500-meter arrival heights) show that the back 

trajectories for Grand Junction were more likely to have crossed the Painted Desert and southeastern Utah 

than those for Telluride and Durango, which measured lower PM10 concentrations on this day.

Figure A-18. Discreet plumes of blowing dust in New Mexico, Mexico, and Arizona visible in GOES 

satellite imagery for May 20, 2008 (http://www.osei.noaa.gov/Events/Dust/US_Southwest/2008/DSTusmx142_G12.jpg ).

K-means cluster analysis has been applied to Grand Junction Powell PM10 concentrations, Grand 

Junction and Painted Desert 30-day total precipitation for each PM10 monitoring day, and Grand Junction 

and Painted Desert daily maximum wind gust speeds for each monitoring day. K-means cluster analysis 

is a statistical method for identifying clusters or groupings of values for many variables. For 

environmental variables, these clusters often represent distinct processes, conditions, or events. In this 

case, cluster analysis differentiates PM10 concentrations associated with strong winds, low soil moistures, 

and blowing dust by providing mean values for these 5 variables for 5 distinct categories of PM10 events. 

The period of record considered was from January 2004 through March 2009. The Hopi weather station 

located in the central portion of the Painted Desert was used to represent Painted Desert conditions in 

northeastern Arizona, and the Grand Junction National Weather Service station was used to represent 

Grand Junction conditions. The 30-day total precipitation values appear to be a better metric for blowing 

dust conditions than shorter-term totals.
91

Figure A-19. 24-hour NOAA HYSPLIT back trajectories for every hour from 1500 MST to 2200 MST 

for Grand Junction (red), Telluride (green), and Durango (blue) for the dust storm of April 19, 2005.

The results of the cluster analysis are presented in Table A-2 below. Cluster 1 represents high soil 

moisture conditions, moderate gust speeds, and low PM10 concentrations. Cluster 2 represents very low 

soil moisture, moderate PM10, and low gust speeds. Cluster 3 represents low soil moisture, moderate 

gusts, and low PM10. Cluster 4 represents moderate soil moisture, low gusts, and low PM10. Finally, 

Cluster 5 represents high PM10, high gusts, and low soil moisture. Cluster numbers, Grand Junction 

Powell PM10 concentrations, and Grand Junction daily maximum gust speeds are plotted in Figure A-20.

The data in Figure A-20 clearly show that the highest PM10 concentrations tend to occur in Cluster 5 

with gusts above 40 mph. The only exceedance in this period occurred on a day with a peak gust of 43 

mph. Cluster 2 is likely to be indicative of wintertime inversion conditions with lighter winds and 

moderately elevated PM10. Figure A-21 shows the concentrations and cluster values associated with 

Hopi station daily maximum gust speeds. The overall pattern is similar. The highest concentration day 

is associated with a peak gust of 47 mph at Hopi. All of the days/events presented in Figure A-17, A-19, 

and Table A-1 were classified as Cluster 5.
92

Table A-2. K-means cluster analysis means for Grand Junction PM10 and meteorological variables.

Cluster Variables

Cluster 1 

Means

Cluster 2 

Means

Cluster 3

Means

Cluster 4

Means

Cluster 5

Means

Powell 24-hour PM10 in ug/m3 24.5 37.3 24.3 21.8 74.9

Hopi Wind Gust in mph 20.8 18.0 32.5 20.7 40.5

Grand Junction Wind Gust in mph 20.4 16.5 31.8 19.6 43.1

Grand Junction 30-day 

Precipitation 1.7 0.4 0.5 0.8 0.6

Hopi 30-day Precipitation 1.8 0.2 0.5 0.7 0.3

Count 85 120 170 147 24

Figure A-20. Grand Junction Powell 24-hour PM10 concentrations versus Grand Junction gust 

speed by cluster.

Figures A-22 and A-23 show Powell PM10 concentrations versus Grand Junction and Hopi 30-

day precipitation totals, respectively, by cluster. The blowing dust group, Cluster 5, is generally 

associated with 30-day precipitation totals of less than 1.00 inches at Grand Junction and less than 

0.50 inches at Hopi. While this is not proof that the measured dust in Grand Junction is from 

Arizona, it adds to the weight of evidence that the Painted Desert makes a significant contribution 

to PM10 concentrations in Grand Junction during many blowing dust events. Of interest in this 

regard are the two high concentrations (greater than 100 ug/m3) that occurred when Grand 

Junction 30-day precipitation totals were greater than an inch (see Figure A-22). One of these 

occurred when transport was from the southwest. On this day (April 21, 2008) the NOAA 

Satellite Smoke Text Archive reported the following (see 

http://www.ssd.noaa.gov/PS/FIRE/smoke.html ):

“Blowing dust is seen over most of Utah (and part of western Nevada) and the dust is moving 

toward the northeast, reaching into northwestern Colorado and southern Wyoming.”

0

50

100

150

200

250

051 01 52 02 53 03 54 04 55 05 56 0

Grand Junction Gust Speed in mph

Grand Junction Powell 24-hr PM10 - ug/m3

Clusters

1

4

2

3

5
93

Figure A-21. Grand Junction Powell 24-hour PM10 concentrations versus Hopi gust speed by 

cluster.

Figure A-22. Grand Junction Powell 24-hour PM10 concentrations versus Grand Junction 30-day 

total precipitation by cluster.

0

50

100

150

200

250

051 01 52 02 53 03 54 04 55 05 56 0

Hopi Gust Speed in mph

Grand Junction Powell 24-hr PM10 - ug/m3

Clusters

3

4

5

1

2

0

50

100

150

200

250

0.0000.2500.5000.7501.0001.2501.5001.7502.0002.2502.5002.7503.000

Grand Junction 30-day Precipitation in Inches

Grand Junction Powell 24-hr PM10 - ug/m3

Clusters

4

2

3

1

5
94

Figure A-23. Grand Junction Powell 24-hour PM10 concentrations versus Hopi 30-day total 

precipitation by cluster.

The other occurred on April 15, 2008, when the flow was from Arizona and southeast Utah. The 

transport conditions, the discrepancy between high recent precipitation in Grand Junction and low recent 

precipitation at Hopi for these two days, and, in one case, analyst discussion of what was visible in 

satellite images suggest that much of the dust might have originated from outside of the Grand Junction 

environment. 

Figure A-24 shows Grand Junction Powell 24-hour PM10 concentrations versus peak gust wind 

directions at the Little Delores RAWS weather station about 25 miles west-southwest of Grand Junction. 

Grand Junction is situated on the floor of the Grand Valley, a major northwest to southeast trending basin 

than can force or channel synoptic scale flows. As a result, surface wind directions in Grand Junction 

may not be useful indicators of the direction of longer-range transport. Little Delores is on the 

Umcompahgre Plateau, and winds here are more likely to reflect the larger-scale transport directions for 

the region. This graph indicates that high PM10 at Grand Junction (Cluster 5) is associated with winds 

from the south-southeast to west-southwest at Little Delores. These directions point to dust sources in 

southeast Utah and northeastern Arizona. This is further evidence that dust from these areas may make a 

significant contribution to PM10 measured in Grand Junction during blowing dust events.

0

50

100

150

200

250

0.0000.2500.5000.7501.0001.2501.5001.7502.0002.2502.5002.7503.000

Hopi 30-day Precipitation in Inches

Grand Junction Powell 24-hr PM10 - ug/m3

Clusters

3

4

5

1

2
95

Figure A-24. Grand Junction Powell 24-hour PM10 concentrations versus peak gust wind directions at 

the Little Delores RAWS weather station, by cluster.

Figure A-25 presents monthly percentiles for Grand Junction gust speeds. Wind gusts generally 

considered to be high enough for significant blowing dusts (40 mph or higher) are within the upper 5 to 

15 percent during each month of the year. Consequently, these events can be viewed as exceptional 

rather than normal. Gusts in this category can occur any month of the year, but are most likely in March, 

April, May and October. Figure A-4 shows that in Grand Junction these are typically among the wettest 

months of the year. It is in drier years, therefore, that blowing dust may be most prevalent during the 

spring and fall months. January, February, and June are typically very dry, and might be expected to 

have a significant proportion of blowing dust events.

Figures A-26 and A-27 show histograms for Grand Junction and Hopi wind gusts, respectively. The 95th

percentile gust speed for Grand Junction is 43 mph. For Hopi it is 41 mph. For both sites, it is clear that 

gusts in the range that is associated with blowing dust are the exception rather than the rule. Cluster 

analysis also shows that the blowing dust events represent only 4% of the PM10 sample days (from Table 

A-2, Cluster 5 had 24 cases out of a total of 546). The weight of evidence presented in this document 

clearly suggests that source regions in Arizona and Utah can have a significant impact on PM10 

concentrations in Grand Junction during blowing dust events and that these events occur when dry soils 

are affected by winds of exceptional strength. Control of these sources, which are outside of Colorado, 

may not be reasonably achievable or possible.

The precipitation climatology for the Four Corners area indicates that the area can be susceptible to 

blowing dust when winds are high. Landform imagery shows that northeastern Arizona and southeastern 

Utah in particular have experienced a long-term pattern of wind erosion and blowing dust when winds 

have been southwesterly and blowing into western and southern Colorado. Back trajectories, case 

studies, satellite imagery, and statistical analyses have also shown that northeastern Arizona and 

southeastern Utah are a significant source for blowing dust transported into Colorado. Elevated PM10 

in Grand Junction during windstorms is generally associated with wind gusts of 40 mph or higher at 

Grand Junction and Hopi in northeastern Arizona and southwesterly flow in Grand Junction. Elevated 

PM10 in Grand Junction is generally associated with 30-day precipitation totals of less than 1.00 inches at 

Grand Junction and less than 0.50 inches at Hopi.

0

50

100

150

200

250

03 06 09 0120150180210240270300330360

Little Delores Gust Direction

Grand Junction Powell 24-hr PM10 - ug/m3

Clusters

1

4

2

3

5
96

Reference:

Orgill, M.M., Sehmel, G.A., 1976. Frequency and diurnal variation of dust storms in the contiguous USA. 

Atmospheric Environment 10, 813–825

Figure A-25. Percentile plot of Grand Junction daily maximum 5-second gust speed in miles per 

hour showing that gusts of 40 mph or greater always occur within the top 15 percentile speeds for 

each month of the year.

0

10

20

30

40

50

60

70

1 2 3 4 5 6 7 8 9 10 11 12

Percentile Plot

Grand Junction Daily Max 5-second Gust in mph

Month

Gust Speed in mph

Top 15% in Red, Lower 15% in Blue, Median Orange

January 2004-February 2009
97

Figure A-26. Histogram of daily maximum 5-second wind gusts at Grand Junction based on January 

2004 – February 2009.

Figure A-27. Histogram of daily maximum 5-second wind gusts at Hopi based on January 2004 –

February 2009.

0

71

143

214

286

357

429

500

0 10 20 30 40 50 60 70

Daily Max 5-second Gust in mph

Count

0

43

86

129

171

214

257

300

0 10 20 30 40 50 60 70

Daily Max Gust in mph

Count
98

Attachment B

Hourly MesoWest Surface maps,

for

April 3, 2009
99

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 15:41 UTC 

April 3, 2009 or 8:41 AM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 16:41 UTC 

April 3, 2009 or 9:41 AM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).
100

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 17:41 UTC 

April 3, 2009 or 10:41 AM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 18:41 UTC 

April 3, 2009 or 11:41 AM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).
101

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 19:41 UTC 

April 3, 2009 or 12:41 PM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 20:41 UTC 

April 3, 2009 or 1:41 PM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).
102

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 21:41 UTC 

April 3, 2009 or 2:41 PM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 22:41 UTC 

April 3, 2009 or 3:41 PM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).
103

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 23:41 UTC 

April 3, 2009 or 4:41 PM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 00:41 UTC 

April 4, 2009 or 5:41 PM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).
104

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 01:41 UTC 

April 4, 2009 or 6:41 PM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 02:41 UTC 

April 4, 2009 or 7:41 PM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).
105

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 03:41 UTC 

April 4, 2009 or 8:41 PM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 04:41 UTC 

April 4, 2009 or 9:41 PM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).
106

Wind directions and gust speeds in dust source regions and the Pagosa Springs area at 05:41 UTC 

April 4, 2009 or 10:41 PM MST April 3, 2009 (http://www.met.utah.edu/mesowest/).
107

Attachment C

Streamline Analyses

for 

April 3, 2009
108

Surface streamlines 16Z April 3, 2009 or 9 AM MST April 3, 2009 (from Plymouth State Weather 

Center http://vortex.plymouth.edu/u-make.html).

Surface streamlines 17Z April 3, 2009 or 10 AM MST April 3, 2009 (from Plymouth State 

Weather Center http://vortex.plymouth.edu/u-make.html).
109

Surface streamlines 18Z April 3, 2009 or 11 AM MST April 3, 2009 (from Plymouth State 

Weather Center http://vortex.plymouth.edu/u-make.html).

Surface streamlines 19Z April 3, 2009 or 12 PM MST April 3, 2009 (from Plymouth State 

Weather Center http://vortex.plymouth.edu/u-make.html).
110

Surface streamlines 20Z April 3, 2009 or 1 PM MST April 3, 2009 (from Plymouth State Weather 

Center http://vortex.plymouth.edu/u-make.html).

Surface streamlines 21Z April 3, 2009 or 2 PM MST April 3, 2009 (from Plymouth State Weather 

Center http://vortex.plymouth.edu/u-make.html).
111

Surface streamlines 22Z April 3, 2009 or 3 PM MST April 3, 2009 (from Plymouth State Weather 

Center http://vortex.plymouth.edu/u-make.html).

Surface streamlines 23Z April 3, 2009 or 4 PM MST April 3, 2009 (from Plymouth State Weather 

Center http://vortex.plymouth.edu/u-make.html).
112

Surface streamlines 00Z April 4, 2009 or 5 PM MST April 3, 2009 (from Plymouth State Weather 

Center http://vortex.plymouth.edu/u-make.html).

Surface streamlines 01Z April 4, 2009 or 6 PM MST April 3, 2009 (from Plymouth State Weather 

Center http://vortex.plymouth.edu/u-make.html).
113

Surface streamlines 02Z April 4, 2009 or 7 PM MST April 3, 2009 (from Plymouth State Weather 

Center http://vortex.plymouth.edu/u-make.html).

Surface streamlines 03Z April 4, 2009 or 8 PM MST April 3, 2009 (from Plymouth State Weather 

Center http://vortex.plymouth.edu/u-make.html).
114

Surface streamlines 04Z April 4, 2009 or 9 PM MST April 3, 2009 (from Plymouth State Weather 

Center http://vortex.plymouth.edu/u-make.html).

Surface streamlines 05Z April 4, 2009 or 10 PM MST April 3, 2009 (from Plymouth State 

Weather Center http://vortex.plymouth.edu/u-make.html).
115

Attachment D

NWS Grand Junction, Colorado, Forecast 

Office,

NWS Albuquerque, New Mexico, Forecast 

Office,

and

NWS Flagstaff, Arizona, Forecast Office

High Wind Advisories,

High Wind Watches,

and

High Wind Warnings
116

for

April 3, 2009

 NWS SRRS PRODUCTS FOR:

 2009040200 to 2009040323

Grand Junction Colorado, National Weather Service Forecast Office

WWUS75 KGJT 030929

NPWGJT

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE GRAND JUNCTION CO

329 AM MDT FRI APR 3 2009

COZ021-UTZ022-029-031800-

/O.NEW.KGJT.WI.Y.0004.090403T1800Z-090404T0600Z/

FOUR CORNERS/UPPER DOLORES RIVER-SOUTHEAST UTAHCANYONLANDS/NATURAL BRIDGESINCLUDING THE CITIES OF...CORTEZ...DOVE CREEK...MANCOS...

BLANDING...BLUFF...MEXICAN HAT

329 AM MDT FRI APR 3 2009

...WIND ADVISORY IN EFFECT FROM NOON TODAY TO MIDNIGHT MDT

TONIGHT...

THE NATIONAL WEATHER SERVICE IN GRAND JUNCTION HAS ISSUED A WIND

ADVISORY...WHICH IS IN EFFECT FROM NOON TODAY UNTIL MIDNIGHT MDT

TONIGHT.

A STORM APPROACHING FROM THE WEST AND NORTHWEST WILL RESULT IN

WINDY CONDITIONS DEVELOPING ACROSS SOUTHEAST UTAH AND THE FOUR

CORNERS AREA TODAY. SOUTHWEST WINDS 15 TO 25 MPH WITH OCCASIONAL

GUSTS TO 45 MPH ARE EXPECTED THIS AFTERNOON AND EVENING. STRONGER

WIND GUSTS WILL BE POSSIBLE FROM ANY FAST MOVING SHOWER OR
117

THUNDERSTORM THAT MIGHT DEVELOP LATE TODAY. WINDS WILL DECREASE

LATE THIS EVENING AS THE SURFACE LOW MOVES EAST OF THE AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

WIND GUSTS FROM 45 TO 57 MPH ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES. USE

EXTRA CAUTION.

&&

$$

JAD

WWUS75 KGJT 031805

NPWGJT

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE GRAND JUNCTION CO

1205 PM MDT FRI APR 3 2009

COZ021-UTZ022-029-040215-

/O.CON.KGJT.WI.Y.0004.000000T0000Z-090404T0600Z/

FOUR CORNERS/UPPER DOLORES RIVER-SOUTHEAST UTAHCANYONLANDS/NATURAL BRIDGESINCLUDING THE CITIES OF...CORTEZ...DOVE CREEK...MANCOS...

BLANDING...BLUFF...MEXICAN HAT

1205 PM MDT FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT...

A WIND ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT.

A STORM APPROACHING FROM THE WEST AND NORTHWEST WILL RESULT IN

WINDY CONDITIONS DEVELOPING ACROSS SOUTHEAST UTAH AND THE FOUR

CORNERS AREA TODAY. SOUTHWEST WINDS 15 TO 25 MPH WITH OCCASIONAL

GUSTS TO 45 MPH ARE EXPECTED THIS AFTERNOON AND EVENING. STRONGER

WIND GUSTS WILL BE POSSIBLE FROM ANY FAST MOVING SHOWER OR

THUNDERSTORM THAT MIGHT DEVELOP LATE TODAY. WINDS WILL DECREASE

LATE THIS EVENING AS THE SURFACE LOW MOVES EAST OF THE AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

WIND GUSTS FROM 45 TO 57 MPH ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

USE EXTRA CAUTION.

&&

$$

WWUS75 KGJT 032131

NPWGJT

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE GRAND JUNCTION CO

331 PM MDT FRI APR 3 2009

COZ021-UTZ022-029-040600-

/O.CON.KGJT.WI.Y.0004.000000T0000Z-090404T0600Z/

FOUR CORNERS/UPPER DOLORES RIVER-SOUTHEAST UTAHCANYONLANDS/NATURAL BRIDGESINCLUDING THE CITIES OF...CORTEZ...DOVE CREEK...MANCOS...

BLANDING...BLUFF...MEXICAN HAT

331 PM MDT FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT...

A WIND ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT.

A STORM APPROACHING FROM THE WEST AND NORTHWEST WILL RESULT IN

WINDY CONDITIONS DEVELOPING ACROSS SOUTHEAST UTAH AND THE FOUR

CORNERS AREA THIS EVENING. SOUTHWEST WINDS 15 TO 25 MPH WITH OCCASIONAL

GUSTS TO 45 MPH ARE EXPECTED LATE THIS AFTERNOON AND EVENING. STRONGER

WIND GUSTS WILL BE POSSIBLE FROM ANY FAST MOVING SHOWER OR
118

THUNDERSTORM THAT MIGHT DEVELOP LATE TODAY. WINDS WILL DECREASE

LATE THIS EVENING AS THE SURFACE LOW MOVES EAST OF THE AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

WIND GUSTS FROM 45 TO 57 MPH ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

USE EXTRA CAUTION.

&&

$$

WWUS75 KGJT 032131

NPWGJT

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE GRAND JUNCTION CO

331 PM MDT FRI APR 3 2009

COZ021-UTZ022-029-040600-

/O.CON.KGJT.WI.Y.0004.000000T0000Z-090404T0600Z/

FOUR CORNERS/UPPER DOLORES RIVER-SOUTHEAST UTAHCANYONLANDS/NATURAL BRIDGESINCLUDING THE CITIES OF...CORTEZ...DOVE CREEK...MANCOS...

BLANDING...BLUFF...MEXICAN HAT

331 PM MDT FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT...

A WIND ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT TONIGHT.

A STORM APPROACHING FROM THE WEST AND NORTHWEST WILL RESULT IN

WINDY CONDITIONS DEVELOPING ACROSS SOUTHEAST UTAH AND THE FOUR

CORNERS AREA THIS EVENING. SOUTHWEST WINDS 15 TO 25 MPH WITH OCCASIONAL

GUSTS TO 45 MPH ARE EXPECTED LATE THIS AFTERNOON AND EVENING. STRONGER

WIND GUSTS WILL BE POSSIBLE FROM ANY FAST MOVING SHOWER OR

THUNDERSTORM THAT MIGHT DEVELOP LATE TODAY. WINDS WILL DECREASE

LATE THIS EVENING AS THE SURFACE LOW MOVES EAST OF THE AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

WIND GUSTS FROM 45 TO 57 MPH ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

USE EXTRA CAUTION.

&&

$$

 NWS SRRS PRODUCTS FOR:

 2009040200 to 2009040323

Albuquerque New Mexico, National Weather Service Forecast Office

WWUS75 KABQ 020302

NPWABQ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE ALBUQUERQUE NM

902 PM MDT WED APR 1 2009

NMZ001-003-008-009-014-015-020415-

/O.EXP.KABQ.WI.Y.0021.000000T0000Z-090402T0300Z/

NORTHWEST PLATEAU-UPPER RIO GRANDE VALLEY-WEST CENTRAL MOUNTAINSMIDDLE RIO GRANDE VALLEY/ALBUQUERQUE METRO AREASOUTHWEST MOUNTAINS/UPPER GILA REGION-LOWER RIO GRANDE VALLEYINCLUDING THE CITIES OF...FARMINGTON...ESPANOLA...GALLUP/GRANTS...

ALBUQUERQUE...GLENWOOD...SOCORRO

902 PM MDT WED APR 1 2009

...WIND ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING...

THE WIND ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING.
119

NORTHWEST TO NORTH WINDS WILL STILL BLOW OCCASIONALLY AT SPEEDS OF

15 TO 25 MPH WITH SOME GUSTS BETWEEN 30 AND 40 MPH THROUGH 11 PM

OR MIDNIGHT. WINDS WILL DECREASE SLOWLY THEREAFTER.

$$

NMZ005-010-011-016-017-019-026-020415-

/O.EXP.KABQ.WI.Y.0021.000000T0000Z-090402T0300Z/

NORTHEAST HIGHLANDS-SANDIA/MANZANO MOUNTAINSCENTRAL HIGH PLAINS/ESTANCIA VALLEYLINCOLN COUNTY HIGH PLAINS/HONDO VALLEYCAPITAN/NORTHERN SACRAMENTO MOUNTAINS-CHAVES COUNTY PLAINSGUADALUPE MOUNTAINS OF CHAVES COUNTYINCLUDING THE CITIES OF...LAS VEGAS/RATON...

SANDIA PARK/CEDAR CREST...MORIARTY/ESTANCIA...CARRIZOZO...

RUIDOSO...ROSWELL

902 PM MDT WED APR 1 2009

...WIND ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING...

THE WIND ADVISORY WILL EXPIRE AT 9 PM MDT THIS EVENING.

NORTHWEST TO NORTH WINDS WILL STILL BLOW OCCASIONALLY AT SPEEDS OF

20 TO 30 MPH WITH SOME GUSTS BETWEEN 35 AND 45 MPH THROUGH

MIDNIGHT OR 1 AM MDT. WINDS WILL DECREASE SLOWLY THROUGH THE EARLY

MORNING HOURS.

$$

NMZ006-007-021200-

/O.CON.KABQ.WI.Y.0021.000000T0000Z-090402T1200Z/

HARDING COUNTY-FAR NORTHEAST PLAINSINCLUDING THE CITIES OF...ROY...CLAYTON

902 PM MDT WED APR 1 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT THURSDAY...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT THURSDAY.

BREEZY WEST AND NORTHWEST WINDS WILL SHIFT LATE THIS EVENING IN

THE NORTHEASTERN PLAINS. STRONG NORTHERLY WINDS WILL THEN DEVELOP

AS A COLD FRONT ROLLS THROUGH THE EASTERN PLAINS OF NEW MEXICO.

SUSTAINED WIND SPEEDS OF 25 TO 35 MPH ARE EXPECTED ALONG AND JUST

BEHIND THE FRONT WITH OCCASIONAL GUSTS UP TO 55 MPH POSSIBLE.

WINDS WILL REMAIN QUITE STRONG THROUGH THE OVERNIGHT...AND WILL

GRADUALLY WEAKEN BY SUNRISE THURSDAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

&&

$$

NMZ013-020-021-021200-

/O.CON.KABQ.WI.Y.0021.000000T0000Z-090402T1200Z/

QUAY COUNTY-ROOSEVELT COUNTY-CURRY COUNTYINCLUDING THE CITIES OF...TUCUMCARI...PORTALES...CLOVIS

902 PM MDT WED APR 1 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT THURSDAY...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT THURSDAY.

SUSTAINED WEST TO NORTHWEST WINDS OF 25 TO 40 MPH WITH GUSTS TO AROUND

55 MPH WILL CONTINUE ACROSS MUCH OF THE EAST CENTRAL AND SOUTHEAST

PLAINS...IN ADVANCE OF A COLD FRONT. THE WIND IS EXPECTED TO SHIFT

TO THE NORTH AND NORTHWEST NEAR TO A COUPLE HOURS AFTER MIDNIGHT AS

THE FRONT COMES THROUGH...BUT WILL CONTINUE TO BE STRONG IN THE WAKE

OF THE FRONT FOR A FEW HOURS. VISIBILITIES AT TIMES MAY BE REDUCED

IN BLOWING DUST...WHICH MAY IMPACT TRAVEL THROUGH THE AREA. THIS

INCLUDES PORTIONS OF INTERSTATE 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND
120

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

&&

$$

NMZ012-018-021200-

/O.CON.KABQ.WI.Y.0021.000000T0000Z-090402T1200Z/

CONCHAS LAKE/GUADALUPE COUNTY-DE BACA COUNTYINCLUDING THE CITIES OF...SANTA ROSA...FORT SUMNER

902 PM MDT WED APR 1 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT THURSDAY...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT THURSDAY.

SUSTAINED WEST TO NORTHWEST WINDS OF 25 TO 40 MPH WITH GUSTS TO AROUND

55 MPH WILL CONTINUE ACROSS MUCH OF THE EAST CENTRAL AND SOUTHEAST

PLAINS...IN ADVANCE OF A COLD FRONT. THE WIND IS EXPECTED TO SHIFT

TO THE NORTH AND NORTHWEST NEAR TO A COUPLE HOURS AFTER MIDNIGHT AS

THE FRONT COMES THROUGH...BUT WILL CONTINUE TO BE STRONG IN THE WAKE

OF THE FRONT FOR A FEW HOURS. VISIBILITIES AT TIMES MAY BE REDUCED

IN BLOWING DUST...WHICH MAY IMPACT TRAVEL THROUGH THE AREA. THIS

INCLUDES PORTIONS OF INTERSTATE 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

&&

$$

WWUS75 KABQ 031035

NPWABQ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE ALBUQUERQUE NM

435 AM MDT FRI APR 3 2009

...EXTENDED PERIOD OF WINDY CONDITIONS EXPECTED THROUGH SATURDAY...

.A STRONG UPPER LEVEL LOW PRESSURE SYSTEM SLIDING EAST ACROSS THE

SOUTHERN ROCKIES WILL COMBINE WITH AN AREA OF LOW PRESSURE OVER

SOUTHEAST COLORADO TO CREATE STRONG SOUTHWEST TO WEST WINDS TODAY

AND SATURDAY. SOUTHWEST WINDS WILL INCREASE ACROSS THE WESTERN

MOUNTAINS...THE CENTRAL HIGH PLAINS...THE SACRAMENTO...SANDIA...

AND MANZANO MOUNTAINS THIS AFTERNOON AND CONTINUE THROUGH TONIGHT.

WINDS WILL GRADUALLY TURN TO THE WEST AND MAY INCREASE EVEN MORE

OVER THE EASTERN PLAINS SATURDAY. THE POTENTIAL EXISTS FOR LOCALLY

DAMAGING WIND GUSTS ACROSS THE SACRAMENTO MOUNTAINS TONIGHT AND

OVER PORTIONS OF THE EASTERN PLAINS SATURDAY. AREAS OF BLOWING

DUST ARE ALSO POSSIBLE OVER THE EASTERN PLAINS BY LATE SATURDAY

MORNING WITH REDUCED VISIBILITIES.

NMZ005-010>012-016-026-031800-

/O.NEW.KABQ.WI.Y.0022.090403T1800Z-090404T1200Z/

/O.NEW.KABQ.HW.A.0006.090404T1200Z-090405T0300Z/

NORTHEAST HIGHLANDS-SANDIA/MANZANO MOUNTAINSCENTRAL HIGH PLAINS/ESTANCIA VALLEY-CONCHAS LAKE/GUADALUPE COUNTYLINCOLN COUNTY HIGH PLAINS/HONDO VALLEYGUADALUPE MOUNTAINS OF CHAVES COUNTYINCLUDING THE CITIES OF...LAS VEGAS/RATON...

SANDIA PARK/CEDAR CREST...MORIARTY/ESTANCIA...SANTA ROSA...

CARRIZOZO

435 AM MDT FRI APR 3 2009

...WIND ADVISORY IN EFFECT FROM NOON TODAY TO 6 AM MDT SATURDAY...

...HIGH WIND WATCH IN EFFECT FROM SATURDAY MORNING THROUGH

SATURDAY EVENING...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A WIND
121

ADVISORY...WHICH IS IN EFFECT FROM NOON TODAY TO 6 AM MDT

SATURDAY. A HIGH WIND WATCH HAS ALSO BEEN ISSUED. THIS HIGH WIND

WATCH IS IN EFFECT FROM SATURDAY MORNING THROUGH SATURDAY

EVENING.

SOUTHWEST WINDS WILL INCREASE TO 25 TO 35 MPH WITH GUSTS UP TO

45 MPH THIS AFTERNOON. WINDS WILL CONTINUE THROUGH TONIGHT...

PARTICULARLY OVER THE CENTRAL HIGH PLAINS AND NORTHEAST HIGHLANDS.

WINDS WILL GRADUALLY TURN TO THE WEST THROUGH SATURDAY MORNING

AND ARE EXPECTED TO INCREASE TO BETWEEN 30 AND 40 MPH WITH GUSTS

AS HIGH AS 65 MPH EARLY SATURDAY AFTERNOON. WINDS WILL DIMINISH

GRADUALLY LATE SATURDAY AFTERNOON TO EASE THE HAZARDOUS

CONDITIONS. STRONG WINDS WILL AFFECT TRAVEL ALONG LOCATIONS SUCH

AS INTERSTATE 25 AND INTERSTATE 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

REMEMBER...A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A

HAZARDOUS HIGH WIND EVENT IN AND CLOSE TO THE WATCH AREA.

&&

$$

NMZ017-031800-

/O.NEW.KABQ.WI.Y.0022.090403T1800Z-090404T0300Z/

/O.NEW.KABQ.HW.A.0006.090404T0300Z-090405T0300Z/

CAPITAN/NORTHERN SACRAMENTO MOUNTAINSINCLUDING THE CITY OF...RUIDOSO

435 AM MDT FRI APR 3 2009

...WIND ADVISORY IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS

EVENING...

...HIGH WIND WATCH IN EFFECT FROM THIS EVENING THROUGH SATURDAY

EVENING...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A WIND

ADVISORY...WHICH IS IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS

EVENING. A HIGH WIND WATCH HAS ALSO BEEN ISSUED. THIS HIGH WIND

WATCH IS IN EFFECT FROM THIS EVENING THROUGH SATURDAY EVENING.

SOUTHWEST WINDS WILL INCREASE TO 25 TO 35 MPH WITH GUSTS UP TO

45 MPH THIS AFTERNOON. WINDS MAY INCREASE EVEN MORE AFTER SUNSET

TONIGHT AND CONTINUE THROUGH EARLY SATURDAY AFTERNOON. STRONG

SOUTHWEST WINDS OF 35 TO 45 MPH WITH LOCAL GUSTS UP TO 65 MPH

ARE POSSIBLE TONIGHT INTO SATURDAY AFTERNOON. WINDS WILL GRADUALLY

TURN TO THE WEST SATURDAY AFTERNOON AND DIMINISH BELOW HAZARDOUS

LEVELS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

REMEMBER...A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A

HAZARDOUS HIGH WIND EVENT IN AND CLOSE TO THE WATCH AREA.

&&

$$

NMZ008-014-031800-

/O.NEW.KABQ.WI.Y.0022.090403T1800Z-090404T1200Z/

WEST CENTRAL MOUNTAINS-SOUTHWEST MOUNTAINS/UPPER GILA REGIONINCLUDING THE CITIES OF...GALLUP/GRANTS...GLENWOOD

435 AM MDT FRI APR 3 2009

...WIND ADVISORY IN EFFECT FROM NOON TODAY TO 6 AM MDT SATURDAY...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A WIND

ADVISORY...WHICH IS IN EFFECT FROM NOON TODAY TO 6 AM MDT

SATURDAY.
122

SOUTHWEST WINDS WILL INCREASE TO 25 TO 35 MPH WITH GUSTS UP TO

45 MPH THIS AFTERNOON. WINDS WILL GRADUALLY TURN TO THE WEST THIS

EVENING AND CONTINUE THROUGH TONIGHT. WINDS ARE EXPECTED TO DIMINISH

AROUND SUNRISE SATURDAY TO EASE THESE HAZARDOUS CONDITIONS. WINDY

CONDITIONS WILL IMPACT TRAVEL ALONG THE INTERSTATE 40 CORRIDOR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

&&

$$

NMZ006-007-013-018>021-031800-

/O.NEW.KABQ.HW.A.0006.090404T1200Z-090405T0300Z/

HARDING COUNTY-FAR NORTHEAST PLAINS-QUAY COUNTY-DE BACA COUNTYCHAVES COUNTY PLAINS-ROOSEVELT COUNTY-CURRY COUNTYINCLUDING THE CITIES OF...ROY...CLAYTON...TUCUMCARI...

FORT SUMNER...ROSWELL...PORTALES...CLOVIS

435 AM MDT FRI APR 3 2009

...HIGH WIND WATCH IN EFFECT FROM SATURDAY MORNING THROUGH

SATURDAY EVENING...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A HIGH

WIND WATCH...WHICH IS IN EFFECT FROM SATURDAY MORNING THROUGH

SATURDAY EVENING.

SOUTHWEST WINDS WILL INCREASE LATE TONIGHT AND BECOME STRONG

EARLY SATURDAY MORNING. WEST WINDS OF 30 TO 40 MPH WITH LOCAL

GUSTS UP TO 60 MPH ARE POSSIBLE SATURDAY MORNING THROUGH SATURDAY

AFTERNOON. AREAS OF BLOWING DUST ARE POSSIBLE SATURDAY AFTERNOON

WITH REDUCED VISIBILITIES. TRAVEL ALONG INTERSTATE 40 WILL BE

IMPACTED BY STRONG WINDS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A

HAZARDOUS HIGH WIND EVENT IN AND CLOSE TO THE WATCH AREA.

&&

$$

GUYER

WWUS75 KABQ 031035

NPWABQ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE ALBUQUERQUE NM

435 AM MDT FRI APR 3 2009

...EXTENDED PERIOD OF WINDY CONDITIONS EXPECTED THROUGH SATURDAY...

.A STRONG UPPER LEVEL LOW PRESSURE SYSTEM SLIDING EAST ACROSS THE

SOUTHERN ROCKIES WILL COMBINE WITH AN AREA OF LOW PRESSURE OVER

SOUTHEAST COLORADO TO CREATE STRONG SOUTHWEST TO WEST WINDS TODAY

AND SATURDAY. SOUTHWEST WINDS WILL INCREASE ACROSS THE WESTERN

MOUNTAINS...THE CENTRAL HIGH PLAINS...THE SACRAMENTO...SANDIA...

AND MANZANO MOUNTAINS THIS AFTERNOON AND CONTINUE THROUGH TONIGHT.

WINDS WILL GRADUALLY TURN TO THE WEST AND MAY INCREASE EVEN MORE

OVER THE EASTERN PLAINS SATURDAY. THE POTENTIAL EXISTS FOR LOCALLY

DAMAGING WIND GUSTS ACROSS THE SACRAMENTO MOUNTAINS TONIGHT AND

OVER PORTIONS OF THE EASTERN PLAINS SATURDAY. AREAS OF BLOWING

DUST ARE ALSO POSSIBLE OVER THE EASTERN PLAINS BY LATE SATURDAY

MORNING WITH REDUCED VISIBILITIES.

NMZ005-010>012-016-026-031800-

/O.NEW.KABQ.WI.Y.0022.090403T1800Z-090404T1200Z/

/O.NEW.KABQ.HW.A.0006.090404T1200Z-090405T0300Z/

NORTHEAST HIGHLANDS-SANDIA/MANZANO MOUNTAINSCENTRAL HIGH PLAINS/ESTANCIA VALLEY-CONCHAS LAKE/GUADALUPE COUNTY-
123

LINCOLN COUNTY HIGH PLAINS/HONDO VALLEYGUADALUPE MOUNTAINS OF CHAVES COUNTYINCLUDING THE CITIES OF...LAS VEGAS/RATON...

SANDIA PARK/CEDAR CREST...MORIARTY/ESTANCIA...SANTA ROSA...

CARRIZOZO

435 AM MDT FRI APR 3 2009

...WIND ADVISORY IN EFFECT FROM NOON TODAY TO 6 AM MDT SATURDAY...

...HIGH WIND WATCH IN EFFECT FROM SATURDAY MORNING THROUGH

SATURDAY EVENING...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A WIND

ADVISORY...WHICH IS IN EFFECT FROM NOON TODAY TO 6 AM MDT

SATURDAY. A HIGH WIND WATCH HAS ALSO BEEN ISSUED. THIS HIGH WIND

WATCH IS IN EFFECT FROM SATURDAY MORNING THROUGH SATURDAY

EVENING.

SOUTHWEST WINDS WILL INCREASE TO 25 TO 35 MPH WITH GUSTS UP TO

45 MPH THIS AFTERNOON. WINDS WILL CONTINUE THROUGH TONIGHT...

PARTICULARLY OVER THE CENTRAL HIGH PLAINS AND NORTHEAST HIGHLANDS.

WINDS WILL GRADUALLY TURN TO THE WEST THROUGH SATURDAY MORNING

AND ARE EXPECTED TO INCREASE TO BETWEEN 30 AND 40 MPH WITH GUSTS

AS HIGH AS 65 MPH EARLY SATURDAY AFTERNOON. WINDS WILL DIMINISH

GRADUALLY LATE SATURDAY AFTERNOON TO EASE THE HAZARDOUS

CONDITIONS. STRONG WINDS WILL AFFECT TRAVEL ALONG LOCATIONS SUCH

AS INTERSTATE 25 AND INTERSTATE 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

REMEMBER...A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A

HAZARDOUS HIGH WIND EVENT IN AND CLOSE TO THE WATCH AREA.

&&

$$

NMZ017-031800-

/O.NEW.KABQ.WI.Y.0022.090403T1800Z-090404T0300Z/

/O.NEW.KABQ.HW.A.0006.090404T0300Z-090405T0300Z/

CAPITAN/NORTHERN SACRAMENTO MOUNTAINSINCLUDING THE CITY OF...RUIDOSO

435 AM MDT FRI APR 3 2009

...WIND ADVISORY IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS

EVENING...

...HIGH WIND WATCH IN EFFECT FROM THIS EVENING THROUGH SATURDAY

EVENING...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A WIND

ADVISORY...WHICH IS IN EFFECT FROM NOON TODAY TO 9 PM MDT THIS

EVENING. A HIGH WIND WATCH HAS ALSO BEEN ISSUED. THIS HIGH WIND

WATCH IS IN EFFECT FROM THIS EVENING THROUGH SATURDAY EVENING.

SOUTHWEST WINDS WILL INCREASE TO 25 TO 35 MPH WITH GUSTS UP TO

45 MPH THIS AFTERNOON. WINDS MAY INCREASE EVEN MORE AFTER SUNSET

TONIGHT AND CONTINUE THROUGH EARLY SATURDAY AFTERNOON. STRONG

SOUTHWEST WINDS OF 35 TO 45 MPH WITH LOCAL GUSTS UP TO 65 MPH

ARE POSSIBLE TONIGHT INTO SATURDAY AFTERNOON. WINDS WILL GRADUALLY

TURN TO THE WEST SATURDAY AFTERNOON AND DIMINISH BELOW HAZARDOUS

LEVELS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

REMEMBER...A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A

HAZARDOUS HIGH WIND EVENT IN AND CLOSE TO THE WATCH AREA.

&&
124

$$

NMZ008-014-031800-

/O.NEW.KABQ.WI.Y.0022.090403T1800Z-090404T1200Z/

WEST CENTRAL MOUNTAINS-SOUTHWEST MOUNTAINS/UPPER GILA REGIONINCLUDING THE CITIES OF...GALLUP/GRANTS...GLENWOOD

435 AM MDT FRI APR 3 2009

...WIND ADVISORY IN EFFECT FROM NOON TODAY TO 6 AM MDT SATURDAY...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A WIND

ADVISORY...WHICH IS IN EFFECT FROM NOON TODAY TO 6 AM MDT

SATURDAY.

SOUTHWEST WINDS WILL INCREASE TO 25 TO 35 MPH WITH GUSTS UP TO

45 MPH THIS AFTERNOON. WINDS WILL GRADUALLY TURN TO THE WEST THIS

EVENING AND CONTINUE THROUGH TONIGHT. WINDS ARE EXPECTED TO DIMINISH

AROUND SUNRISE SATURDAY TO EASE THESE HAZARDOUS CONDITIONS. WINDY

CONDITIONS WILL IMPACT TRAVEL ALONG THE INTERSTATE 40 CORRIDOR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

&&

$$

NMZ006-007-013-018>021-031800-

/O.NEW.KABQ.HW.A.0006.090404T1200Z-090405T0300Z/

HARDING COUNTY-FAR NORTHEAST PLAINS-QUAY COUNTY-DE BACA COUNTYCHAVES COUNTY PLAINS-ROOSEVELT COUNTY-CURRY COUNTYINCLUDING THE CITIES OF...ROY...CLAYTON...TUCUMCARI...

FORT SUMNER...ROSWELL...PORTALES...CLOVIS

435 AM MDT FRI APR 3 2009

...HIGH WIND WATCH IN EFFECT FROM SATURDAY MORNING THROUGH

SATURDAY EVENING...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A HIGH

WIND WATCH...WHICH IS IN EFFECT FROM SATURDAY MORNING THROUGH

SATURDAY EVENING.

SOUTHWEST WINDS WILL INCREASE LATE TONIGHT AND BECOME STRONG

EARLY SATURDAY MORNING. WEST WINDS OF 30 TO 40 MPH WITH LOCAL

GUSTS UP TO 60 MPH ARE POSSIBLE SATURDAY MORNING THROUGH SATURDAY

AFTERNOON. AREAS OF BLOWING DUST ARE POSSIBLE SATURDAY AFTERNOON

WITH REDUCED VISIBILITIES. TRAVEL ALONG INTERSTATE 40 WILL BE

IMPACTED BY STRONG WINDS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A

HAZARDOUS HIGH WIND EVENT IN AND CLOSE TO THE WATCH AREA.

&&

$$

GUYER

WWUS75 KABQ 031803

NPWABQ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE ALBUQUERQUE NM

1203 PM MDT FRI APR 3 2009

...STRONG TO VERY STRONG WINDS NOW EXPECTED TO BEGIN AS EARLY AS

THIS AFTERNOON IN CENTRAL AND WESTERN NEW MEXICO...

.A POTENT UPPER LEVEL LOW PRESSURE SYSTEM CROSSING THE WESTERN

U.S. WILL COMBINE WITH A SURFACE LOW OVER SOUTHEAST COLORADO TO

CREATE VERY STRONG SOUTHWEST AND WEST WINDS. THE STRONGEST WINDS

WILL DEVELOP IN THE WESTERN MOUNTAINS THIS AFTERNOON AND EVENING

BEFORE SHIFTING TO THE SOUTH CENTRAL MOUNTAINS LATE THIS EVENING

AND INCLUDING THE EAST SLOPES OF THE CENTRAL MOUNTAIN CHAIN AND
125

EASTERN PLAINS THROUGH SATURDAY. THE POTENTIAL EXISTS FOR LOCALLY

DAMAGING WIND GUSTS ACROSS THE SACRAMENTO MOUNTAINS TONIGHT AND

OVER PORTIONS OF THE EASTERN PLAINS SATURDAY. NOW...THE MIDDLE AND

LOWER RIO GRANDE VALLEY CAN ALSO EXPECT STRONG WINDS LATE THIS

AFTERNOON THROUGH EARLY EVENING. THE STRONG WINDS IN THE WESTERN

MOUNTAINS WILL GRADUALLY WEAKEN AFTER MIDNIGHT WITH LESS WINDY

CONDITIONS IN THE CENTRAL VALLEY AND WESTERN MOUNTAINS ON

SATURDAY. AREAS OF BLOWING DUST WILL SIGNIFICANTLY REDUCE

VISIBILITIES IN DUST PRONE LOCATIONS.

NMZ008-014-032300-

/O.UPG.KABQ.WI.Y.0022.000000T0000Z-090404T1200Z/

/O.NEW.KABQ.HW.W.0011.090403T1803Z-090404T1200Z/

WEST CENTRAL MOUNTAINS-SOUTHWEST MOUNTAINS/UPPER GILA REGIONINCLUDING THE CITIES OF...GALLUP/GRANTS...GLENWOOD

1203 PM MDT FRI APR 3 2009

...HIGH WIND WARNING IN EFFECT UNTIL 6 AM MDT SATURDAY...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A HIGH

WIND WARNING...WHICH IS IN EFFECT UNTIL 6 AM MDT SATURDAY. THE

WIND ADVISORY IS NO LONGER IN EFFECT.

SOUTHWEST WINDS WILL INCREASE TO 30 TO 40 MPH WITH GUSTS UP TO 60 MPH

THIS AFTERNOON. WINDS WILL GRADUALLY TURN TO THE WEST THIS EVENING

WITH THE STRONGEST WINDS CONTINUING THROUGH THE EVENING. AFTER

MIDNIGHT WIND SPEEDS WILL GRADUALLY DECREASE TO 25 TO 35 MPH WITH

GUSTS UP TO 45 MPH...WITH THE STRONGEST WINDS ACROSS THE HIGHER

TERRAIN AND SIGNIFICANTLY WEAKER WINDS IN VALLEYS. HAZARDOUS WINDS ARE

EXPECTED TO DIMINISH BY SUNRISE SATURDAY. BLOWING DUST WILL DROP

VISIBILITY BELOW ONE HALF MILE AT TIMES IN DUST PRONE

LOCATIONS...INCLUDING PORTIONS OF THE I-40 CORRIDOR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WARNING

AREA. BE ALERT TO SUDDEN GUSTS OF WIND WHICH MAY CAUSE YOU TO LOSE

CONTROL OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS

WINDS WHEN DRIVING ON NORTH SOUTH OR EAST WEST ORIENTED ROADS.

REMEMBER...A HIGH WIND WARNING MEANS HAZARDOUS WEATHER CONDITIONS

ARE IMMINENT OR HIGHLY LIKELY.

&&

$$

NMZ009-015-032300-

/O.EXB.KABQ.WI.Y.0022.090403T2100Z-090404T0300Z/

MIDDLE RIO GRANDE VALLEY/ALBUQUERQUE METRO AREALOWER RIO GRANDE VALLEYINCLUDING THE CITIES OF...ALBUQUERQUE...SOCORRO

1203 PM MDT FRI APR 3 2009

...WIND ADVISORY IN EFFECT FROM 3 PM THIS AFTERNOON TO 9 PM MDT

THIS EVENING...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A WIND

ADVISORY...WHICH IS IN EFFECT FROM 3 PM THIS AFTERNOON TO 9 PM

MDT THIS EVENING.

SOUTHWEST WINDS WILL INCREASE TO 25 TO 35 MPH WITH GUSTS FROM 45

TO 50 MPH THIS AFTERNOON. THE STRONG WINDS WILL WEAKEN

SIGNIFICANTLY AROUND SUNSET WITH HAZARDOUS CONDITIONS NO LONGER

EXPECTED AFTER 9 PM. BLOWING DUST WILL DROP VISIBILITY BELOW ONE

MILE AT TIMES IN DUST PRONE LOCATIONS...INCLUDING PORTIONS OF I-40

AND I-25.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

REMEMBER...A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A
126

HAZARDOUS HIGH WIND EVENT IN AND CLOSE TO THE WATCH AREA.

&&

$$

NMZ005-010>012-016-026-032300-

/O.CON.KABQ.WI.Y.0022.000000T0000Z-090404T1200Z/

/O.CON.KABQ.HW.A.0006.090404T1200Z-090405T0300Z/

NORTHEAST HIGHLANDS-SANDIA/MANZANO MOUNTAINSCENTRAL HIGH PLAINS/ESTANCIA VALLEY-CONCHAS LAKE/GUADALUPE COUNTYLINCOLN COUNTY HIGH PLAINS/HONDO VALLEYGUADALUPE MOUNTAINS OF CHAVES COUNTYINCLUDING THE CITIES OF...LAS VEGAS/RATON...

SANDIA PARK/CEDAR CREST...MORIARTY/ESTANCIA...SANTA ROSA...

CARRIZOZO

1203 PM MDT FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT SATURDAY...

...HIGH WIND WATCH REMAINS IN EFFECT FROM SATURDAY MORNING

THROUGH SATURDAY EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT SATURDAY. A HIGH

WIND WATCH REMAINS IN EFFECT FROM SATURDAY MORNING THROUGH

SATURDAY EVENING.

SOUTHWEST WINDS WILL INCREASE TO 25 TO 35 MPH WITH GUSTS UP TO

45 MPH THIS AFTERNOON. WINDS WILL CONTINUE THROUGH TONIGHT...

PARTICULARLY OVER THE CENTRAL HIGH PLAINS AND NORTHEAST

HIGHLANDS. WINDS WILL GRADUALLY TURN TO THE WEST THROUGH SATURDAY

MORNING AND ARE EXPECTED TO INCREASE TO BETWEEN 30 AND 40 MPH

WITH GUSTS AS HIGH AS 65 MPH EARLY SATURDAY AFTERNOON. WINDS WILL

DIMINISH GRADUALLY LATE SATURDAY AFTERNOON TO EASE THE HAZARDOUS

CONDITIONS. STRONG WINDS WILL AFFECT TRAVEL ALONG LOCATIONS SUCH

AS INTERSTATE 25 AND INTERSTATE 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

REMEMBER...A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A

HAZARDOUS HIGH WIND EVENT IN AND CLOSE TO THE WATCH AREA.

&&

$$

NMZ017-032300-

/O.CON.KABQ.WI.Y.0022.000000T0000Z-090404T0300Z/

/O.CON.KABQ.HW.A.0006.090404T0300Z-090405T0300Z/

CAPITAN/NORTHERN SACRAMENTO MOUNTAINSINCLUDING THE CITY OF...RUIDOSO

1203 PM MDT FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING...

...HIGH WIND WATCH REMAINS IN EFFECT FROM 9 PM MDT THIS EVENING

THROUGH SATURDAY EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING. A

HIGH WIND WATCH REMAINS IN EFFECT FROM 9 PM MDT THIS EVENING

THROUGH SATURDAY EVENING.

SOUTHWEST WINDS WILL INCREASE TO 25 TO 35 MPH WITH GUSTS UP TO

45 MPH THIS AFTERNOON. WINDS MAY INCREASE EVEN MORE AFTER SUNSET

TONIGHT AND CONTINUE THROUGH EARLY SATURDAY AFTERNOON. STRONG

SOUTHWEST WINDS OF 35 TO 45 MPH WITH LOCAL GUSTS UP TO 65 MPH ARE

POSSIBLE TONIGHT INTO SATURDAY AFTERNOON. WINDS WILL GRADUALLY

TURN TO THE WEST SATURDAY AFTERNOON AND DIMINISH BELOW HAZARDOUS

LEVELS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL
127

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

REMEMBER...A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A

HAZARDOUS HIGH WIND EVENT IN AND CLOSE TO THE WATCH AREA.

&&

$$

NMZ006-007-013-018>021-032300-

/O.CON.KABQ.HW.A.0006.090404T1200Z-090405T0300Z/

HARDING COUNTY-FAR NORTHEAST PLAINS-QUAY COUNTY-DE BACA COUNTYCHAVES COUNTY PLAINS-ROOSEVELT COUNTY-CURRY COUNTYINCLUDING THE CITIES OF...ROY...CLAYTON...TUCUMCARI...

FORT SUMNER...ROSWELL...PORTALES...CLOVIS

1203 PM MDT FRI APR 3 2009

...HIGH WIND WATCH REMAINS IN EFFECT FROM SATURDAY MORNING

THROUGH SATURDAY EVENING...

A HIGH WIND WATCH REMAINS IN EFFECT FROM SATURDAY MORNING THROUGH

SATURDAY EVENING.

SOUTHWEST WINDS WILL INCREASE LATE TONIGHT AND BECOME STRONG

EARLY SATURDAY MORNING. WEST WINDS OF 30 TO 40 MPH WITH LOCAL

GUSTS UP TO 60 MPH ARE POSSIBLE SATURDAY MORNING THROUGH SATURDAY

AFTERNOON. AREAS OF BLOWING DUST ARE POSSIBLE SATURDAY AFTERNOON

WITH REDUCED VISIBILITIES. TRAVEL ALONG INTERSTATE 40 WILL BE

IMPACTED BY STRONG WINDS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A

HAZARDOUS HIGH WIND EVENT IN AND CLOSE TO THE WATCH AREA.

&&

$$

44/43/50

WWUS75 KABQ 031819

NPWABQ

URGENT - WEATHER MESSAGE...CORRECTED

NATIONAL WEATHER SERVICE ALBUQUERQUE NM

1203 PM MDT FRI APR 3 2009

CORRECTED RECOMMENDED PRECAUTIONARY ACTIONS FOR NMZ008-014 AND

NMZ009-015

...STRONG TO VERY STRONG WINDS NOW EXPECTED TO BEGIN AS EARLY AS

THIS AFTERNOON IN CENTRAL AND WESTERN NEW MEXICO...

.A POTENT UPPER LEVEL LOW PRESSURE SYSTEM CROSSING THE WESTERN

U.S. WILL COMBINE WITH A SURFACE LOW OVER SOUTHEAST COLORADO TO

CREATE VERY STRONG SOUTHWEST AND WEST WINDS. THE STRONGEST WINDS

WILL DEVELOP IN THE WESTERN MOUNTAINS THIS AFTERNOON AND EVENING

BEFORE SHIFTING TO THE SOUTH CENTRAL MOUNTAINS LATE THIS EVENING

AND INCLUDING THE EAST SLOPES OF THE CENTRAL MOUNTAIN CHAIN AND

EASTERN PLAINS THROUGH SATURDAY. THE POTENTIAL EXISTS FOR LOCALLY

DAMAGING WIND GUSTS ACROSS THE SACRAMENTO MOUNTAINS TONIGHT AND

OVER PORTIONS OF THE EASTERN PLAINS SATURDAY. NOW...THE MIDDLE AND

LOWER RIO GRANDE VALLEY CAN ALSO EXPECT STRONG WINDS LATE THIS

AFTERNOON THROUGH EARLY EVENING. THE STRONG WINDS IN THE WESTERN

MOUNTAINS WILL GRADUALLY WEAKEN AFTER MIDNIGHT WITH LESS WINDY

CONDITIONS IN THE CENTRAL VALLEY AND WESTERN MOUNTAINS ON

SATURDAY. AREAS OF BLOWING DUST WILL SIGNIFICANTLY REDUCE

VISIBILITIES IN DUST PRONE LOCATIONS.

NMZ008-014-032300-

/O.UPG.KABQ.WI.Y.0022.000000T0000Z-090404T1200Z/

/O.COR.KABQ.HW.W.0011.090403T1803Z-090404T1200Z/

WEST CENTRAL MOUNTAINS-SOUTHWEST MOUNTAINS/UPPER GILA REGIONINCLUDING THE CITIES OF...GALLUP/GRANTS...GLENWOOD

1203 PM MDT FRI APR 3 2009
128

...HIGH WIND WARNING IN EFFECT UNTIL 6 AM MDT SATURDAY...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A HIGH

WIND WARNING...WHICH IS IN EFFECT UNTIL 6 AM MDT SATURDAY. THE

WIND ADVISORY IS NO LONGER IN EFFECT.

SOUTHWEST WINDS WILL INCREASE TO 30 TO 40 MPH WITH GUSTS UP TO 60 MPH

THIS AFTERNOON. WINDS WILL GRADUALLY TURN TO THE WEST THIS EVENING

WITH THE STRONGEST WINDS CONTINUING THROUGH THE EVENING. AFTER

MIDNIGHT WIND SPEEDS WILL GRADUALLY DECREASE TO 25 TO 35 MPH WITH

GUSTS UP TO 45 MPH...WITH THE STRONGEST WINDS ACROSS THE HIGHER

TERRAIN AND SIGNIFICANTLY WEAKER WINDS IN VALLEYS. HAZARDOUS WINDS ARE

EXPECTED TO DIMINISH BY SUNRISE SATURDAY. BLOWING DUST WILL DROP

VISIBILITY BELOW ONE HALF MILE AT TIMES IN DUST PRONE

LOCATIONS...INCLUDING PORTIONS OF THE I-40 CORRIDOR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WARNING

AREA. BE ALERT TO SUDDEN GUSTS OF WIND WHICH MAY CAUSE YOU TO LOSE

CONTROL OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS

WINDS.

REMEMBER...A HIGH WIND WARNING MEANS HAZARDOUS WEATHER CONDITIONS

ARE IMMINENT OR HIGHLY LIKELY.

&&

$$

NMZ009-015-032300-

/O.COR.KABQ.WI.Y.0022.090403T2100Z-090404T0300Z/

MIDDLE RIO GRANDE VALLEY/ALBUQUERQUE METRO AREALOWER RIO GRANDE VALLEYINCLUDING THE CITIES OF...ALBUQUERQUE...SOCORRO

1203 PM MDT FRI APR 3 2009

...WIND ADVISORY IN EFFECT FROM 3 PM THIS AFTERNOON TO 9 PM MDT

THIS EVENING...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A WIND

ADVISORY...WHICH IS IN EFFECT FROM 3 PM THIS AFTERNOON TO 9 PM

MDT THIS EVENING.

SOUTHWEST WINDS WILL INCREASE TO 25 TO 35 MPH WITH GUSTS FROM 45

TO 50 MPH THIS AFTERNOON. THE STRONG WINDS WILL WEAKEN

SIGNIFICANTLY AROUND SUNSET WITH HAZARDOUS CONDITIONS NO LONGER

EXPECTED AFTER 9 PM. BLOWING DUST WILL DROP VISIBILITY BELOW ONE

MILE AT TIMES IN DUST PRONE LOCATIONS...INCLUDING PORTIONS OF I-40

AND I-25.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

&&

$$

NMZ005-010>012-016-026-032300-

/O.CON.KABQ.WI.Y.0022.000000T0000Z-090404T1200Z/

/O.CON.KABQ.HW.A.0006.090404T1200Z-090405T0300Z/

NORTHEAST HIGHLANDS-SANDIA/MANZANO MOUNTAINSCENTRAL HIGH PLAINS/ESTANCIA VALLEY-CONCHAS LAKE/GUADALUPE COUNTYLINCOLN COUNTY HIGH PLAINS/HONDO VALLEYGUADALUPE MOUNTAINS OF CHAVES COUNTYINCLUDING THE CITIES OF...LAS VEGAS/RATON...

SANDIA PARK/CEDAR CREST...MORIARTY/ESTANCIA...SANTA ROSA...

CARRIZOZO

1203 PM MDT FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT SATURDAY...

...HIGH WIND WATCH REMAINS IN EFFECT FROM SATURDAY MORNING

THROUGH SATURDAY EVENING...
129

A WIND ADVISORY REMAINS IN EFFECT UNTIL 6 AM MDT SATURDAY. A HIGH

WIND WATCH REMAINS IN EFFECT FROM SATURDAY MORNING THROUGH

SATURDAY EVENING.

SOUTHWEST WINDS WILL INCREASE TO 25 TO 35 MPH WITH GUSTS UP TO

45 MPH THIS AFTERNOON. WINDS WILL CONTINUE THROUGH TONIGHT...

PARTICULARLY OVER THE CENTRAL HIGH PLAINS AND NORTHEAST

HIGHLANDS. WINDS WILL GRADUALLY TURN TO THE WEST THROUGH SATURDAY

MORNING AND ARE EXPECTED TO INCREASE TO BETWEEN 30 AND 40 MPH

WITH GUSTS AS HIGH AS 65 MPH EARLY SATURDAY AFTERNOON. WINDS WILL

DIMINISH GRADUALLY LATE SATURDAY AFTERNOON TO EASE THE HAZARDOUS

CONDITIONS. STRONG WINDS WILL AFFECT TRAVEL ALONG LOCATIONS SUCH

AS INTERSTATE 25 AND INTERSTATE 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

REMEMBER...A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A

HAZARDOUS HIGH WIND EVENT IN AND CLOSE TO THE WATCH AREA.

&&

$$

NMZ017-032300-

/O.CON.KABQ.WI.Y.0022.000000T0000Z-090404T0300Z/

/O.CON.KABQ.HW.A.0006.090404T0300Z-090405T0300Z/

CAPITAN/NORTHERN SACRAMENTO MOUNTAINSINCLUDING THE CITY OF...RUIDOSO

1203 PM MDT FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING...

...HIGH WIND WATCH REMAINS IN EFFECT FROM 9 PM MDT THIS EVENING

THROUGH SATURDAY EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING. A

HIGH WIND WATCH REMAINS IN EFFECT FROM 9 PM MDT THIS EVENING

THROUGH SATURDAY EVENING.

SOUTHWEST WINDS WILL INCREASE TO 25 TO 35 MPH WITH GUSTS UP TO

45 MPH THIS AFTERNOON. WINDS MAY INCREASE EVEN MORE AFTER SUNSET

TONIGHT AND CONTINUE THROUGH EARLY SATURDAY AFTERNOON. STRONG

SOUTHWEST WINDS OF 35 TO 45 MPH WITH LOCAL GUSTS UP TO 65 MPH ARE

POSSIBLE TONIGHT INTO SATURDAY AFTERNOON. WINDS WILL GRADUALLY

TURN TO THE WEST SATURDAY AFTERNOON AND DIMINISH BELOW HAZARDOUS

LEVELS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

REMEMBER...A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A

HAZARDOUS HIGH WIND EVENT IN AND CLOSE TO THE WATCH AREA.

&&

$$

NMZ006-007-013-018>021-032300-

/O.CON.KABQ.HW.A.0006.090404T1200Z-090405T0300Z/

HARDING COUNTY-FAR NORTHEAST PLAINS-QUAY COUNTY-DE BACA COUNTYCHAVES COUNTY PLAINS-ROOSEVELT COUNTY-CURRY COUNTYINCLUDING THE CITIES OF...ROY...CLAYTON...TUCUMCARI...

FORT SUMNER...ROSWELL...PORTALES...CLOVIS

1203 PM MDT FRI APR 3 2009

...HIGH WIND WATCH REMAINS IN EFFECT FROM SATURDAY MORNING

THROUGH SATURDAY EVENING...

A HIGH WIND WATCH REMAINS IN EFFECT FROM SATURDAY MORNING THROUGH

SATURDAY EVENING.

SOUTHWEST WINDS WILL INCREASE LATE TONIGHT AND BECOME STRONG
130

EARLY SATURDAY MORNING. WEST WINDS OF 30 TO 40 MPH WITH LOCAL

GUSTS UP TO 60 MPH ARE POSSIBLE SATURDAY MORNING THROUGH SATURDAY

AFTERNOON. AREAS OF BLOWING DUST ARE POSSIBLE SATURDAY AFTERNOON

WITH REDUCED VISIBILITIES. TRAVEL ALONG INTERSTATE 40 WILL BE

IMPACTED BY STRONG WINDS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A

HAZARDOUS HIGH WIND EVENT IN AND CLOSE TO THE WATCH AREA.

&&

$$

44/43/50

WWUS75 KABQ 032214

NPWABQ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE ALBUQUERQUE NM

414 PM MDT FRI APR 3 2009

...STRONG TO VERY STRONG WINDS EXPECTED TONIGHT INTO SATURDAY...

.AN INTENSE UPPER LEVEL LOW PRESSURE SYSTEM APPROACHING FROM THE

GREAT BASIN WILL COMBINE WITH SURFACE LOW PRESSURE OVER SOUTHEAST

COLORADO TO CREATE STRONG TO VERY STRONG SOUTHWEST AND WEST

WINDS. THE STRONGEST WINDS WILL BE ACROSS THE WESTERN AND CENTRAL

MOUNTAINS TONIGHT THEN INCLUDE THE EASTERN PLAINS THROUGH SATURDAY.

THE POTENTIAL EXISTS FOR LOCALLY DAMAGING WIND GUSTS ACROSS AND

JUST TO THE LEE OF THE MOUNTAINS TONIGHT AND OVER PORTIONS OF THE

EAST HALF OF THE STATE SATURDAY. THE MIDDLE AND LOWER RIO GRANDE

VALLEY CAN ALSO EXPECT STRONG WINDS INTO AT LEAST MID EVENING.

THE STRONG WINDS IN THE WESTERN MOUNTAINS WILL GRADUALLY WEAKEN

AFTER MIDNIGHT WITH LESS WINDY CONDITIONS IN THE CENTRAL VALLEY

AND WESTERN MOUNTAINS ON SATURDAY. AREAS OF BLOWING DUST WILL

SIGNIFICANTLY REDUCE VISIBILITIES IN DUST PRONE LOCATIONS.

NMZ012-040300-

/O.CAN.KABQ.WI.Y.0022.000000T0000Z-090404T1200Z/

/O.UPG.KABQ.HW.A.0006.090404T1200Z-090405T0300Z/

/O.EXB.KABQ.HW.W.0011.090404T1200Z-090405T0200Z/

CONCHAS LAKE/GUADALUPE COUNTYINCLUDING THE CITY OF...SANTA ROSA

414 PM MDT FRI APR 3 2009

...HIGH WIND WARNING IN EFFECT FROM 6 AM TO 8 PM MDT SATURDAY...

...WIND ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A HIGH

WIND WARNING...WHICH IS IN EFFECT FROM 6 AM TO 8 PM MDT SATURDAY.

THE WIND ADVISORY HAS BEEN CANCELLED. THE HIGH WIND WATCH IS NO

LONGER IN EFFECT.

WINDS WILL GRADUALLY TURN TO THE WEST THROUGH SATURDAY MORNING

AND ARE EXPECTED TO INCREASE TO BETWEEN 30 AND 40 MPH WITH GUSTS

AS HIGH AS 60 OR 65 MPH DURING THE MORNING AND INTO THE AFTERNOON

SATURDAY. AREAS OF BLOWING DUST ARE LIKELY TO DEVELOP. WINDS WILL

DIMINISH GRADUALLY LATE SATURDAY AFTERNOON TO EASE THE HAZARDOUS

CONDITIONS. STRONG WINDS WILL AFFECT TRAVEL ALONG LOCATIONS SUCH

AS INTERSTATE 25 AND INTERSTATE 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A HIGH WIND WARNING MEANS HAZARDOUS WEATHER CONDITIONS

ARE IMMINENT OR HIGHLY LIKELY.

&&

$$

NMZ005-010-011-016-026-040300-

/O.UPG.KABQ.WI.Y.0022.000000T0000Z-090404T1200Z/

/O.UPG.KABQ.HW.A.0006.090404T1200Z-090405T0300Z/
131

/O.EXB.KABQ.HW.W.0011.090403T2214Z-090405T0000Z/

NORTHEAST HIGHLANDS-SANDIA/MANZANO MOUNTAINSCENTRAL HIGH PLAINS/ESTANCIA VALLEYLINCOLN COUNTY HIGH PLAINS/HONDO VALLEYGUADALUPE MOUNTAINS OF CHAVES COUNTYINCLUDING THE CITIES OF...LAS VEGAS/RATON...

SANDIA PARK/CEDAR CREST...MORIARTY/ESTANCIA...CARRIZOZO

414 PM MDT FRI APR 3 2009

...HIGH WIND WARNING IN EFFECT UNTIL 6 PM MDT SATURDAY...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A HIGH

WIND WARNING...WHICH IS IN EFFECT UNTIL 6 PM MDT SATURDAY. THE

WIND ADVISORY IS NO LONGER IN EFFECT. THE HIGH WIND WATCH IS NO

LONGER IN EFFECT.

SOUTHWEST WINDS WILL INCREASE TO BETWEEN 30 AND 45 MPH WITH GUSTS

UP TO 65 MPH TONIGHT. WINDS WILL GRADUALLY TURN TO THE WEST

THROUGH SATURDAY MORNING AND ARE EXPECTED TO CONTINUE BETWEEN

30 AND 45 MPH WITH GUSTS AS HIGH AS 65 MPH INTO SATURDAY

AFTERNOON. WINDS WILL BEGIN TO DIMINISH GRADUALLY LATE SATURDAY

AFTERNOON. STRONG WINDS WILL AFFECT TRAVEL ALONG LOCATIONS SUCH

AS INTERSTATE 25 AND INTERSTATE 40. AREAS OF BLOWING DUST ARE

LIKELY TO DEVELOP.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A HIGH WIND WARNING MEANS HAZARDOUS WEATHER CONDITIONS

ARE IMMINENT OR HIGHLY LIKELY.

&&

$$

NMZ017-040300-

/O.UPG.KABQ.WI.Y.0022.000000T0000Z-090404T0300Z/

/O.UPG.KABQ.HW.A.0006.090404T0300Z-090405T0300Z/

/O.EXB.KABQ.HW.W.0011.090403T2214Z-090405T0000Z/

CAPITAN/NORTHERN SACRAMENTO MOUNTAINSINCLUDING THE CITY OF...RUIDOSO

414 PM MDT FRI APR 3 2009

...HIGH WIND WARNING IN EFFECT UNTIL 6 PM MDT SATURDAY...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A HIGH

WIND WARNING...WHICH IS IN EFFECT UNTIL 6 PM MDT SATURDAY. THE

WIND ADVISORY IS NO LONGER IN EFFECT. THE HIGH WIND WATCH IS NO

LONGER IN EFFECT.

SOUTHWEST WINDS WILL BLOW BETWEEN 30 AND 45 MPH WITH GUSTS

UP TO 65 OR EVEN 70 MPH TONIGHT. WINDS WILL GRADUALLY TURN TO THE

WEST THROUGH SATURDAY MORNING AND ARE EXPECTED TO CONTINUE BETWEEN

30 AND 45 MPH WITH GUSTS AS HIGH AS 65 MPH INTO SATURDAY

AFTERNOON. WINDS WILL BEGIN TO DIMINISH GRADUALLY LATE SATURDAY

AFTERNOON. AREAS OF BLOWING DUST ARE LIKELY TO DEVELOP.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A HIGH WIND WARNING MEANS HAZARDOUS WEATHER CONDITIONS

ARE IMMINENT OR HIGHLY LIKELY.

&&

$$

NMZ006-007-013-018>021-040300-

/O.UPG.KABQ.HW.A.0006.090404T1200Z-090405T0300Z/

/O.EXB.KABQ.HW.W.0011.090404T1200Z-090405T0200Z/

HARDING COUNTY-FAR NORTHEAST PLAINS-QUAY COUNTY-DE BACA COUNTYCHAVES COUNTY PLAINS-ROOSEVELT COUNTY-CURRY COUNTYINCLUDING THE CITIES OF...ROY...CLAYTON...TUCUMCARI...

FORT SUMNER...ROSWELL...PORTALES...CLOVIS

414 PM MDT FRI APR 3 2009

...HIGH WIND WARNING IN EFFECT FROM 6 AM TO 8 PM MDT SATURDAY...

THE NATIONAL WEATHER SERVICE IN ALBUQUERQUE HAS ISSUED A HIGH
132

WIND WARNING...WHICH IS IN EFFECT FROM 6 AM TO 8 PM MDT SATURDAY.

THE HIGH WIND WATCH IS NO LONGER IN EFFECT.

SOUTHWEST WINDS WILL INCREASE LATE TONIGHT AND BECOME STRONG

SATURDAY MORNING. WEST WINDS OF 30 TO 40 MPH WITH LOCAL GUSTS UP

TO 60 MPH ARE LIKELY SATURDAY MORNING THROUGH SATURDAY

AFTERNOON. AREAS OF BLOWING DUST ARE POSSIBLE SATURDAY AFTERNOON

WITH REDUCED VISIBILITIES. TRAVEL ALONG INTERSTATE 40 WILL BE

IMPACTED BY STRONG WINDS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A HIGH WIND WARNING MEANS HAZARDOUS WEATHER CONDITIONS

ARE IMMINENT OR HIGHLY LIKELY.

&&

$$

NMZ008-014-040300-

/O.CON.KABQ.HW.W.0011.000000T0000Z-090404T1200Z/

WEST CENTRAL MOUNTAINS-SOUTHWEST MOUNTAINS/UPPER GILA REGIONINCLUDING THE CITIES OF...GALLUP/GRANTS...GLENWOOD

414 PM MDT FRI APR 3 2009

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 6 AM MDT SATURDAY...

A HIGH WIND WARNING REMAINS IN EFFECT UNTIL 6 AM MDT SATURDAY.

SOUTHWEST TO WEST WINDS WILL BLOW AT 30 TO 40 MPH WITH GUSTS UP

TO 60 MPH THIS EVENING. AFTER MIDNIGHT WIND SPEEDS WILL GRADUALLY

DECREASE TO 20 TO 35 MPH WITH GUSTS UP TO 45 MPH...BUT REMAIN AT

OR NEAR 30 TO 40 MPH WITH GUSTS NEAR 60 MPH ON THE HIGHER RIDGES

AND PEAKS. HAZARDOUS WINDS ARE EXPECTED TO DIMINISH AN HOUR OR TWO

EITHER SIDE OF SUNRISE SATURDAY. BLOWING DUST WILL DROP VISIBILITY

BELOW ONE HALF MILE AT TIMES IN DUST PRONE LOCATIONS...INCLUDING

PORTIONS OF THE I-40 CORRIDOR.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WARNING

AREA. BE ALERT TO SUDDEN GUSTS OF WIND WHICH MAY CAUSE YOU TO

LOSE CONTROL OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO

CROSS WINDS WHEN DRIVING ON NORTH SOUTH OR EAST WEST ORIENTED

ROADS.

REMEMBER...A HIGH WIND WARNING MEANS HAZARDOUS WEATHER CONDITIONS

ARE IMMINENT OR HIGHLY LIKELY.

&&

$$

NMZ009-015-040300-

/O.CON.KABQ.WI.Y.0022.000000T0000Z-090404T0300Z/

MIDDLE RIO GRANDE VALLEY/ALBUQUERQUE METRO AREALOWER RIO GRANDE VALLEYINCLUDING THE CITIES OF...ALBUQUERQUE...SOCORRO

414 PM MDT FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING.

SOUTHWEST WINDS WILL CONTINUE AROUND 25 TO 35 MPH WITH GUSTS

BETWEEN 35 AND 45 MPH INTO THIS EVENING. THE STRONG WINDS WILL

WEAKEN SIGNIFICANTLY AROUND SUNSET WITH HAZARDOUS CONDITIONS NO

LONGER EXPECTED AFTER 9 PM. THERE MAY BE A FEW PERIODS OF STRONGER

WINDS AGAIN WELL AFTER MIDNIGHT INTO THE MORNING ALONG AND BEHIND

A COLD FRONT. BLOWING DUST WILL DROP VISIBILITY BELOW ONE MILE AT

TIMES IN DUST PRONE LOCATIONS...INCLUDING PORTIONS OF I- 40 AND

I-25.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD EXERCISE CAUTION WHILE DRIVING IN THE WIND

ADVISORY AREA. SUDDEN GUSTS OF WIND MAY CAUSE YOU TO LOSE CONTROL

OF YOUR VEHICLE. EXTRA ATTENTION SHOULD BE GIVEN TO CROSS WINDS.

REMEMBER...A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A
133

HAZARDOUS HIGH WIND EVENT IN AND CLOSE TO THE WATCH AREA.

&&

$$

43

 NWS SRRS PRODUCTS FOR:

 2009040200 to 2009040323

Flagstaff Arizona, National Weather Service Forecast Office

WWUS75 KFGZ 020201

NPWFGZ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE FLAGSTAFF AZ

701 PM MST WED APR 1 2009

AZZ012>014-016-017-021015-

/O.EXP.KFGZ.WI.Y.0008.000000T0000Z-090402T0200Z/

/O.CON.KFGZ.HW.A.0003.090403T1700Z-090404T0300Z/

LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTYLITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTYLITTLE COLORADO RIVER VALLEY IN APACHE COUNTYEASTERN MOGOLLON RIM-WHITE MOUNTAINSINCLUDING THE CITIES OF...WUPATKI N.M....TUBA CITY...WINSLOW...

HOLBROOK...SNOWFLAKE...ST. JOHNS...SPRINGERVILLE...HEBER...

HAPPY JACK...FOREST LAKES...SHOW LOW...GREER...PINETOP

701 PM MST WED APR 1 2009

...HIGH WIND WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH

FRIDAY EVENING...

...WIND ADVISORY WILL EXPIRE AT 7 PM MST THIS EVENING...

THE WIND ADVISORY WILL EXPIRE AT 7 PM MST THIS EVENING. A HIGH

WIND WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY

EVENING.

NORTHWEST WINDS WILL CONTINUE TO DECREASE RAPIDLY THIS EVENING

BEHIND A COLD FRONT THAT MOVED THROUGH EARLIER TODAY. THE WIND

ADVISORY HAS BEEN ALLOWED TO EXPIRE.

BY FRIDAY...A STORM SYSTEM APPROACHING THE REGION WILL BRING

ANOTHER ROUND OF STRONG WINDS DURING THE AFTERNOON AND EVENING.

SOUTHWEST WINDS OF 30 TO 40 MPH WITH GUSTS UP TO 60 MPH WILL BE

POSSIBLE. THERE IS ALSO A POTENTIAL FOR WIDESPREAD BLOWING DUST

CREATING POOR TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WATCH MEANS THERE IS THE POTENTIAL FOR A HAZARDOUS

HIGH WIND EVENT...WITH SUSTAINED WINDS GREATER THAN 40 MPH...OR

GUSTS GREATER THAN 58 MPH. MONITOR THE LATEST FORECASTS AND

WARNINGS FOR UPDATES ON THIS SITUATION. ADDITIONAL WEATHER

INFORMATION IS ON THE WEB AT WWW.WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ004-006>011-015-038>040-021015-

/O.CON.KFGZ.HW.A.0003.090403T1700Z-090404T0300Z/

KAIBAB PLATEAU-GRAND CANYON COUNTRY-COCONINO PLATEAUYAVAPAI COUNTY MOUNTAINSNORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARD-CHINLE VALLEYCHUSKA MOUNTAINS AND DEFIANCE PLATEAU-WESTERN MOGOLLON RIMOAK CREEK AND SYCAMORE CANYONS-BLACK MESA AREANORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264-

INCLUDING THE CITIES OF...JACOB LAKE...FREDONIA...

GRAND CANYON VILLAGE...SUPAI...NORTH RIM...VALLE...PRESCOTT...

SELIGMAN...ASH FORK...KEAMS CANYON...KAIBITO...CANYON DE CHELLY...
134

CHINLE...KAYENTA...WINDOW ROCK...GANADO...FLAGSTAFF...WILLIAMS...

MUNDS PARK...SEDONA...NAVAJO N.M....DILKON...KYKOTSMOVI

701 PM MST WED APR 1 2009

...HIGH WIND WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH

FRIDAY EVENING...

A HIGH WIND WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH

FRIDAY EVENING.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND OF

STRONG WINDS FRIDAY AFTERNOON AND EVENING. SOUTHWEST WINDS OF

30 TO 40 MPH WITH GUSTS UP TO 60 MPH WILL BE POSSIBLE. THERE IS

ALSO A POTENTIAL FOR WIDESPREAD BLOWING DUST CREATING POOR TRAVEL

CONDITIONS DUE TO LIMITED VISIBILITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WATCH MEANS THERE IS THE POTENTIAL FOR A HAZARDOUS

HIGH WIND EVENT...WITH SUSTAINED WINDS GREATER THAN 40 MPH...OR

GUSTS GREATER THAN 58 MPH. MONITOR THE LATEST FORECASTS AND

WARNINGS FOR UPDATES ON THIS SITUATION. ADDITIONAL WEATHER

INFORMATION IS ON THE WEB AT WWW.WEATHER.GOV/FLAGSTAFF.

&&

$$

WWUS75 KFGZ 021228

NPWFGZ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE FLAGSTAFF AZ

528 AM MST THU APR 2 2009

AZZ004-006>017-038>040-022030-

/O.CON.KFGZ.HW.A.0003.090403T1700Z-090404T0300Z/

KAIBAB PLATEAU-GRAND CANYON COUNTRY-COCONINO PLATEAUYAVAPAI COUNTY MOUNTAINSNORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARD-CHINLE VALLEYCHUSKA MOUNTAINS AND DEFIANCE PLATEAULITTLE COLORADO RIVER VALLEY IN COCONINO COUNTYLITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTYLITTLE COLORADO RIVER VALLEY IN APACHE COUNTYWESTERN MOGOLLON RIM-EASTERN MOGOLLON RIM-WHITE MOUNTAINSOAK CREEK AND SYCAMORE CANYONS-BLACK MESA AREANORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264-

INCLUDING THE CITIES OF...JACOB LAKE...FREDONIA...

GRAND CANYON VILLAGE...SUPAI...NORTH RIM...VALLE...PRESCOTT...

SELIGMAN...ASH FORK...KEAMS CANYON...KAIBITO...CANYON DE CHELLY...

CHINLE...KAYENTA...WINDOW ROCK...GANADO...WUPATKI N.M....

TUBA CITY...WINSLOW...HOLBROOK...SNOWFLAKE...ST. JOHNS...

SPRINGERVILLE...FLAGSTAFF...WILLIAMS...MUNDS PARK...HEBER...

HAPPY JACK...FOREST LAKES...SHOW LOW...GREER...PINETOP...SEDONA...

NAVAJO N.M....DILKON...KYKOTSMOVI

528 AM MST THU APR 2 2009

...HIGH WIND WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH

FRIDAY EVENING...

A HIGH WIND WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH

FRIDAY EVENING.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND OF

STRONG WINDS FRIDAY AFTERNOON AND EVENING. SOUTHWEST WINDS OF

30 TO 40 MPH WITH GUSTS UP TO 60 MPH WILL BE POSSIBLE. THERE IS

ALSO A POTENTIAL FOR WIDESPREAD BLOWING DUST CREATING POOR TRAVEL

CONDITIONS DUE TO LIMITED VISIBILITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WATCH MEANS THERE IS THE POTENTIAL FOR A HAZARDOUS

HIGH WIND EVENT...WITH SUSTAINED WINDS GREATER THAN 40 MPH...OR
135

GUSTS GREATER THAN 58 MPH. MONITOR THE LATEST FORECASTS AND

WARNINGS FOR UPDATES ON THIS SITUATION. ADDITIONAL WEATHER

INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

WWUS75 KFGZ 021228

NPWFGZ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE FLAGSTAFF AZ

528 AM MST THU APR 2 2009

AZZ004-006>017-038>040-022030-

/O.CON.KFGZ.HW.A.0003.090403T1700Z-090404T0300Z/

KAIBAB PLATEAU-GRAND CANYON COUNTRY-COCONINO PLATEAUYAVAPAI COUNTY MOUNTAINSNORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARD-CHINLE VALLEYCHUSKA MOUNTAINS AND DEFIANCE PLATEAULITTLE COLORADO RIVER VALLEY IN COCONINO COUNTYLITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTYLITTLE COLORADO RIVER VALLEY IN APACHE COUNTYWESTERN MOGOLLON RIM-EASTERN MOGOLLON RIM-WHITE MOUNTAINSOAK CREEK AND SYCAMORE CANYONS-BLACK MESA AREANORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264-

INCLUDING THE CITIES OF...JACOB LAKE...FREDONIA...

GRAND CANYON VILLAGE...SUPAI...NORTH RIM...VALLE...PRESCOTT...

SELIGMAN...ASH FORK...KEAMS CANYON...KAIBITO...CANYON DE CHELLY...

CHINLE...KAYENTA...WINDOW ROCK...GANADO...WUPATKI N.M....

TUBA CITY...WINSLOW...HOLBROOK...SNOWFLAKE...ST. JOHNS...

SPRINGERVILLE...FLAGSTAFF...WILLIAMS...MUNDS PARK...HEBER...

HAPPY JACK...FOREST LAKES...SHOW LOW...GREER...PINETOP...SEDONA...

NAVAJO N.M....DILKON...KYKOTSMOVI

528 AM MST THU APR 2 2009

...HIGH WIND WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH

FRIDAY EVENING...

A HIGH WIND WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH

FRIDAY EVENING.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND OF

STRONG WINDS FRIDAY AFTERNOON AND EVENING. SOUTHWEST WINDS OF

30 TO 40 MPH WITH GUSTS UP TO 60 MPH WILL BE POSSIBLE. THERE IS

ALSO A POTENTIAL FOR WIDESPREAD BLOWING DUST CREATING POOR TRAVEL

CONDITIONS DUE TO LIMITED VISIBILITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WATCH MEANS THERE IS THE POTENTIAL FOR A HAZARDOUS

HIGH WIND EVENT...WITH SUSTAINED WINDS GREATER THAN 40 MPH...OR

GUSTS GREATER THAN 58 MPH. MONI OTHER -- 1 SECOND PEAK WIND DURING 30 

MIN ACQUISITION PERIOD

WWUS75 KFGZ 021957

NPWFGZ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE FLAGSTAFF AZ

1257 PM MST THU APR 2 2009

AZZ004-006>017-038>040-030700-

/O.CON.KFGZ.HW.A.0003.090403T1700Z-090404T0300Z/

KAIBAB PLATEAU-GRAND CANYON COUNTRY-COCONINO PLATEAUYAVAPAI COUNTY MOUNTAINSNORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARD-CHINLE VALLEYCHUSKA MOUNTAINS AND DEFIANCE PLATEAULITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY-
136

LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTYLITTLE COLORADO RIVER VALLEY IN APACHE COUNTYWESTERN MOGOLLON RIM-EASTERN MOGOLLON RIM-WHITE MOUNTAINSOAK CREEK AND SYCAMORE CANYONS-BLACK MESA AREANORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264-

INCLUDING THE CITIES OF...JACOB LAKE...FREDONIA...

GRAND CANYON VILLAGE...SUPAI...NORTH RIM...VALLE...PRESCOTT...

SELIGMAN...ASH FORK...KEAMS CANYON...KAIBITO...CANYON DE CHELLY...

CHINLE...KAYENTA...WINDOW ROCK...GANADO...WUPATKI N.M....

TUBA CITY...WINSLOW...HOLBROOK...SNOWFLAKE...ST. JOHNS...

SPRINGERVILLE...FLAGSTAFF...WILLIAMS...MUNDS PARK...HEBER...

HAPPY JACK...FOREST LAKES...SHOW LOW...GREER...PINETOP...SEDONA...

NAVAJO N.M....DILKON...KYKOTSMOVI

1257 PM MST THU APR 2 2009

...HIGH WIND WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH

FRIDAY EVENING...

A HIGH WIND WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH

FRIDAY EVENING.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND OF

STRONG WINDS FRIDAY AFTERNOON AND EVENING. SOUTHWEST WINDS OF

30 TO 40 MPH WITH GUSTS UP TO 60 MPH WILL BE POSSIBLE. THERE IS

ALSO A POTENTIAL FOR WIDESPREAD BLOWING DUST CREATING POOR TRAVEL

CONDITIONS DUE TO LIMITED VISIBILITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WATCH MEANS THERE IS THE POTENTIAL FOR A HAZARDOUS

HIGH WIND EVENT...WITH SUSTAINED WINDS GREATER THAN 40 MPH...OR

GUSTS GREATER THAN 58 MPH. MONITOR THE LATEST FORECASTS AND

WARNINGS FOR UPDATES ON THIS SITUATION. ADDITIONAL WEATHER

INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

WWUS75 KFGZ 021957

NPWFGZ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE FLAGSTAFF AZ

1257 PM MST THU APR 2 2009

AZZ004-006>017-038>040-030700-

/O.CON.KFGZ.HW.A.0003.090403T1700Z-090404T0300Z/

KAIBAB PLATEAU-GRAND CANYON COUNTRY-COCONINO PLATEAUYAVAPAI COUNTY MOUNTAINSNORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARD-CHINLE VALLEYCHUSKA MOUNTAINS AND DEFIANCE PLATEAULITTLE COLORADO RIVER VALLEY IN COCONINO COUNTYLITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTYLITTLE COLORADO RIVER VALLEY IN APACHE COUNTYWESTERN MOGOLLON RIM-EASTERN MOGOLLON RIM-WHITE MOUNTAINSOAK CREEK AND SYCAMORE CANYONS-BLACK MESA AREANORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264-

INCLUDING THE CITIES OF...JACOB LAKE...FREDONIA...

GRAND CANYON VILLAGE...SUPAI...NORTH RIM...VALLE...PRESCOTT...

SELIGMAN...ASH FORK...KEAMS CANYON...KAIBITO...CANYON DE CHELLY...

CHINLE...KAYENTA...WINDOW ROCK...GANADO...WUPATKI N.M....

TUBA CITY...WINSLOW...HOLBROOK...SNOWFLAKE...ST. JOHNS...

SPRINGERVILLE...FLAGSTAFF...WILLIAMS...MUNDS PARK...HEBER...

HAPPY JACK...FOREST LAKES...SHOW LOW...GREER...PINETOP...SEDONA...

NAVAJO N.M....DILKON...KYKOTSMOVI

1257 PM MST THU APR 2 2009

...HIGH WIND WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH
137

FRIDAY EVENING...

A HIGH WIND WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH

FRIDAY EVENING.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND OF

STRONG WINDS FRIDAY AFTERNOON AND EVENING. SOUTHWEST WINDS OF

30 TO 40 MPH WITH GUSTS UP TO 60 MPH WILL BE POSSIBLE. THERE IS

ALSO A POTENTIAL FOR WIDESPREAD BLOWING DUST CREATING POOR TRAVEL

CONDITIONS DUE TO LIMITED VISIBILITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WATCH MEANS THERE IS THE POTENTIAL FOR A HAZARDOUS

HIGH WIND EVENT...WITH SUSTAINED WINDS GREATER THAN 40 MPH...OR

GUSTS GREATER THAN 58 MPH. MONITOR THE LATEST FORECASTS AND

WARNINGS FOR UPDATES ON THIS SITUATION. ADDITIONAL WEATHER

INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

WWUS75 KFGZ 030449

NPWFGZ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE FLAGSTAFF AZ

949 PM MST THU APR 2 2009

AZZ007-012-015-031300-

/O.UPG.KFGZ.HW.A.0003.090403T1700Z-090404T0300Z/

/O.NEW.KFGZ.HW.W.0004.090403T1500Z-090404T0300Z/

COCONINO PLATEAU-LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTYWESTERN MOGOLLON RIMINCLUDING THE CITIES OF...VALLE...WUPATKI N.M....TUBA CITY...

FLAGSTAFF...WILLIAMS...MUNDS PARK

949 PM MST THU APR 2 2009

...HIGH WIND WARNING IN EFFECT FROM 8 AM TO 8 PM MST FRIDAY...

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A HIGH WIND

WARNING...WHICH IS IN EFFECT FROM 8 AM TO 8 PM MST FRIDAY. THE

HIGH WIND WATCH IS NO LONGER IN EFFECT.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND

OF STRONG WINDS MUCH OF FRIDAY AND INTO FRIDAY EVENING. SOUTHWEST

WINDS OF 30 TO 40 MPH WITH GUSTS UP TO 60 MPH WILL BE POSSIBLE.

THERE IS ALSO A POTENTIAL FOR AREAS OF BLOWING DUST...CREATING

POOR TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

&&

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED

OR OCCURRING...WITH SUSTAINED WIND SPEEDS GREATER THAN 40 MPH OR

GUSTS GREATER THAN 58 MPH. WINDS THIS STRONG CAN CAUSE PROPERTY

DAMAGE. CONTINUE TO MONITOR THE LATEST FORECASTS. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WWW.WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ013-014-016-017-040-031300-

/O.UPG.KFGZ.HW.A.0003.090403T1700Z-090404T0300Z/

/O.NEW.KFGZ.HW.W.0004.090403T1500Z-090404T0700Z/

LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTYLITTLE COLORADO RIVER VALLEY IN APACHE COUNTYEASTERN MOGOLLON RIM-WHITE MOUNTAINSNORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264-

INCLUDING THE CITIES OF...WINSLOW...HOLBROOK...SNOWFLAKE...

ST. JOHNS...SPRINGERVILLE...HEBER...HAPPY JACK...FOREST LAKES...

SHOW LOW...GREER...PINETOP...DILKON...KYKOTSMOVI

949 PM MST THU APR 2 2009
138

...HIGH WIND WARNING IN EFFECT FROM 8 AM FRIDAY TO MIDNIGHT MST

FRIDAY NIGHT...

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A HIGH WIND

WARNING...WHICH IS IN EFFECT FROM 8 AM FRIDAY TO MIDNIGHT MST

FRIDAY NIGHT. THE HIGH WIND WATCH IS NO LONGER IN EFFECT.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND OF

STRONG WINDS MUCH OF FRIDAY AND FRIDAY EVENING. SOUTHWEST WINDS

OF 30 TO 40 MPH WITH GUSTS UP TO 65 MPH WILL BE POSSIBLE. THERE

WILL ALSO BE WIDESPREAD BLOWING SAND AND DUST...CREATING POOR

TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED

OR OCCURRING...WITH SUSTAINED WIND SPEEDS GREATER THAN 40 MPH OR

GUSTS GREATER THAN 58 MPH. WINDS THIS STRONG CAN CAUSE PROPERTY

DAMAGE. CONTINUE TO MONITOR THE LATEST FORECASTS. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WWW.WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ004-006-009-031300-

/O.UPG.KFGZ.HW.A.0003.090403T1700Z-090404T0300Z/

/O.NEW.KFGZ.WI.Y.0009.090403T1500Z-090404T0300Z/

KAIBAB PLATEAU-GRAND CANYON COUNTRYNORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARDINCLUDING THE CITIES OF...JACOB LAKE...FREDONIA...

GRAND CANYON VILLAGE...SUPAI...NORTH RIM...KEAMS CANYON...KAIBITO

949 PM MST THU APR 2 2009

...WIND ADVISORY IN EFFECT FROM 8 AM TO 8 PM MST FRIDAY...

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A WIND

ADVISORY...WHICH IS IN EFFECT FROM 8 AM TO 8 PM MST FRIDAY. THE

HIGH WIND WATCH IS NO LONGER IN EFFECT.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND

OF STRONG WINDS MUCH OF FRIDAY AND INTO FRIDAY EVENING. SOUTHWEST

WINDS OF 25 TO 35 MPH WITH GUSTS UP TO 45 MPH WILL BE POSSIBLE.

THERE IS ALSO A POTENTIAL FOR AREAS OF BLOWING DUST...CREATING

POOR TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WWW.WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ010-011-039-031300-

/O.UPG.KFGZ.HW.A.0003.090403T1700Z-090404T0300Z/

/O.NEW.KFGZ.WI.Y.0009.090403T1500Z-090404T0500Z/

CHINLE VALLEY-CHUSKA MOUNTAINS AND DEFIANCE PLATEAUBLACK MESA AREAINCLUDING THE CITIES OF...CANYON DE CHELLY...CHINLE...KAYENTA...

WINDOW ROCK...GANADO...NAVAJO N.M.

949 PM MST THU APR 2 2009

...WIND ADVISORY IN EFFECT FROM 8 AM TO 10 PM MST FRIDAY...

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A WIND

ADVISORY...WHICH IS IN EFFECT FROM 8 AM TO 10 PM MST FRIDAY. THE

HIGH WIND WATCH IS NO LONGER IN EFFECT.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND

OF STRONG WINDS MUCH OF FRIDAY AND INTO FRIDAY EVENING. SOUTHWEST

WINDS OF 25 TO 35 MPH WITH GUSTS UP TO 45 MPH WILL BE POSSIBLE.

THERE IS ALSO A POTENTIAL FOR AREAS OF BLOWING DUST...CREATING
139

POOR TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WWW.WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ008-038-031300-

/O.UPG.KFGZ.HW.A.0003.090403T1700Z-090404T0300Z/

/O.NEW.KFGZ.WI.Y.0009.090403T1700Z-090404T0300Z/

YAVAPAI COUNTY MOUNTAINS-OAK CREEK AND SYCAMORE CANYONSINCLUDING THE CITIES OF...PRESCOTT...SELIGMAN...ASH FORK...SEDONA

949 PM MST THU APR 2 2009

...WIND ADVISORY IN EFFECT FROM 10 AM TO 8 PM MST FRIDAY...

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A WIND

ADVISORY...WHICH IS IN EFFECT FROM 10 AM TO 8 PM MST FRIDAY. THE

HIGH WIND WATCH IS NO LONGER IN EFFECT.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND

OF STRONG WINDS MUCH OF FRIDAY AND INTO FRIDAY EVENING. SOUTHWEST

WINDS OF 25 TO 35 MPH WITH GUSTS UP TO 45 MPH WILL BE POSSIBLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WWW.WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ005-031300-

/O.NEW.KFGZ.WI.Y.0009.090403T1500Z-090404T0300Z/

MARBLE AND GLEN CANYONSINCLUDING THE CITIES OF...PAGE...LEES FERRY

949 PM MST THU APR 2 2009

...WIND ADVISORY IN EFFECT FROM 8 AM TO 8 PM MST FRIDAY...

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A WIND

ADVISORY...WHICH IS IN EFFECT FROM 8 AM TO 8 PM MST FRIDAY.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND

OF STRONG WINDS MUCH OF FRIDAY AND INTO FRIDAY EVENING. SOUTHWEST

WINDS OF 25 TO 35 MPH WITH GUSTS UP TO 45 MPH WILL BE POSSIBLE.

THERE IS ALSO A POTENTIAL FOR AREAS OF BLOWING DUST...CREATING

POOR TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WWW.WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ018-037-031300-

/O.NEW.KFGZ.WI.Y.0009.090403T1700Z-090404T0300Z/

NORTHERN GILA COUNTY-YAVAPAI COUNTY VALLEYS AND BASINSINCLUDING THE CITIES OF...PAYSON...STRAWBERRY...YOUNG...

COTTONWOOD...CAMP VERDE...CORDES JUNCTION...BAGDAD

949 PM MST THU APR 2 2009

...WIND ADVISORY IN EFFECT FROM 10 AM TO 8 PM MST FRIDAY...

THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A WIND
140

ADVISORY...WHICH IS IN EFFECT FROM 10 AM TO 8 PM MST FRIDAY.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND

OF STRONG WINDS MUCH OF FRIDAY AND INTO FRIDAY EVENING. SOUTHWEST

WINDS OF 25 TO 35 MPH WITH GUSTS UP TO 45 MPH WILL BE POSSIBLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WWW.WEATHER.GOV/FLAGSTAFF.

&&

$$

WWUS75 KFGZ 031146

NPWFGZ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE FLAGSTAFF AZ

446 AM MST FRI APR 3 2009

AZZ007-012-015-032000-

/O.CON.KFGZ.HW.W.0004.090403T1500Z-090404T0300Z/

COCONINO PLATEAU-LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTYWESTERN MOGOLLON RIMINCLUDING THE CITIES OF...VALLE...WUPATKI N.M....TUBA CITY...

FLAGSTAFF...WILLIAMS...MUNDS PARK

446 AM MST FRI APR 3 2009

...HIGH WIND WARNING REMAINS IN EFFECT FROM 8 AM THIS MORNING TO

8 PM MST THIS EVENING...

A HIGH WIND WARNING REMAINS IN EFFECT FROM 8 AM THIS MORNING TO

8 PM MST THIS EVENING.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND OF

STRONG WINDS TODAY. SOUTHWEST WINDS OF 30 TO 40 MPH WITH GUSTS UP TO

60 MPH WILL BE POSSIBLE. THERE IS ALSO A POTENTIAL FOR AREAS OF

BLOWING DUST...CREATING POOR TRAVEL CONDITIONS DUE TO LIMITED

VISIBILITY.

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED

OR OCCURRING...WITH SUSTAINED WIND SPEEDS GREATER THAN 40 MPH OR

GUSTS GREATER THAN 58 MPH. WINDS THIS STRONG CAN CAUSE PROPERTY

DAMAGE. CONTINUE TO MONITOR THE LATEST FORECASTS. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ013-014-016-017-040-032000-

/O.CON.KFGZ.HW.W.0004.090403T1500Z-090404T0700Z/

LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTYLITTLE COLORADO RIVER VALLEY IN APACHE COUNTYEASTERN MOGOLLON RIM-WHITE MOUNTAINSNORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264-

INCLUDING THE CITIES OF...WINSLOW...HOLBROOK...SNOWFLAKE...

ST. JOHNS...SPRINGERVILLE...HEBER...HAPPY JACK...FOREST LAKES...

SHOW LOW...GREER...PINETOP...DILKON...KYKOTSMOVI

446 AM MST FRI APR 3 2009

...HIGH WIND WARNING REMAINS IN EFFECT FROM 8 AM THIS MORNING TO

MIDNIGHT MST TONIGHT...

A HIGH WIND WARNING REMAINS IN EFFECT FROM 8 AM THIS MORNING TO

MIDNIGHT MST TONIGHT.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND OF

STRONG WINDS TODAY. SOUTHWEST WINDS OF 30 TO 40 MPH WITH GUSTS UP

TO 65 MPH WILL BE POSSIBLE. THERE WILL ALSO BE WIDESPREAD BLOWING

SAND AND DUST...CREATING POOR TRAVEL CONDITIONS DUE TO LIMITED
141

VISIBILITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED

OR OCCURRING...WITH SUSTAINED WIND SPEEDS GREATER THAN 40 MPH OR

GUSTS GREATER THAN 58 MPH. WINDS THIS STRONG CAN CAUSE PROPERTY

DAMAGE. CONTINUE TO MONITOR THE LATEST FORECASTS. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ004>006-009-032000-

/O.CON.KFGZ.WI.Y.0009.090403T1500Z-090404T0300Z/

KAIBAB PLATEAU-MARBLE AND GLEN CANYONS-GRAND CANYON COUNTRYNORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARDINCLUDING THE CITIES OF...JACOB LAKE...FREDONIA...PAGE...

LEES FERRY...GRAND CANYON VILLAGE...SUPAI...NORTH RIM...

KEAMS CANYON...KAIBITO

446 AM MST FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT FROM 8 AM THIS MORNING TO 8 PM

MST THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT FROM 8 AM THIS MORNING TO 8 PM

MST THIS EVENING.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND OF

STRONG WINDS TODAY. SOUTHWEST WINDS OF 25 TO 35 MPH WITH GUSTS UP TO

45 MPH WILL BE POSSIBLE. THERE IS ALSO A POTENTIAL FOR AREAS OF

BLOWING DUST...CREATING POOR TRAVEL CONDITIONS DUE TO LIMITED

VISIBILITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ010-011-039-032000-

/O.CON.KFGZ.WI.Y.0009.090403T1500Z-090404T0500Z/

CHINLE VALLEY-CHUSKA MOUNTAINS AND DEFIANCE PLATEAUBLACK MESA AREAINCLUDING THE CITIES OF...CANYON DE CHELLY...CHINLE...KAYENTA...

WINDOW ROCK...GANADO...NAVAJO N.M.

446 AM MST FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT FROM 8 AM THIS MORNING TO

10 PM MST THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT FROM 8 AM THIS MORNING TO 10 PM

MST THIS EVENING.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND OF

STRONG WINDS TODAY. SOUTHWEST WINDS OF 25 TO 35 MPH WITH GUSTS UP TO

45 MPH WILL BE POSSIBLE. THERE IS ALSO A POTENTIAL FOR AREAS OF

BLOWING DUST...CREATING POOR TRAVEL CONDITIONS DUE TO LIMITED

VISIBILITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ008-018-037-038-032000-
142

/O.CON.KFGZ.WI.Y.0009.090403T1700Z-090404T0300Z/

YAVAPAI COUNTY MOUNTAINS-NORTHERN GILA COUNTYYAVAPAI COUNTY VALLEYS AND BASINS-OAK CREEK AND SYCAMORE CANYONSINCLUDING THE CITIES OF...PRESCOTT...SELIGMAN...ASH FORK...

PAYSON...STRAWBERRY...YOUNG...COTTONWOOD...CAMP VERDE...

CORDES JUNCTION...BAGDAD...SEDONA

446 AM MST FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO

8 PM MST THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 8 PM

MST THIS EVENING.

A STORM SYSTEM APPROACHING THE REGION WILL BRING ANOTHER ROUND OF

STRONG WINDS TODAY. SOUTHWEST WINDS OF 25 TO 35 MPH WITH GUSTS UP TO

45 MPH WILL BE POSSIBLE. THERE IS ALSO A POTENTIAL FOR AREAS OF

BLOWING DUST...CREATING POOR TRAVEL CONDITIONS DUE TO LIMITED

VISIBILITY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

WWUS75 KFGZ 031738

NPWFGZ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE FLAGSTAFF AZ

1038 AM MST FRI APR 3 2009

AZZ007-012-015-040145-

/O.CON.KFGZ.HW.W.0004.000000T0000Z-090404T0300Z/

COCONINO PLATEAU-LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTYWESTERN MOGOLLON RIMINCLUDING THE CITIES OF...VALLE...WUPATKI N.M....TUBA CITY...

FLAGSTAFF...WILLIAMS...MUNDS PARK

1038 AM MST FRI APR 3 2009

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS

EVENING...

A HIGH WIND WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS

EVENING.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND OF

STRONG WINDS TODAY. SOUTHWEST WINDS OF 30 TO 45 MPH WITH GUSTS UP

TO 65 MPH WILL CONTINUE TO OCCUR INTO EARLY THIS EVENING. AREAS OF

BLOWING DUST CAN BE EXPECTED...CREATING POOR TRAVEL CONDITIONS DUE

TO LIMITED VISIBILITY.

PEAK WIND GUSTS REPORTED AS OF 10 AM MST THIS MORNING INCLUDE...

FLAGSTAFF AIRPORT .......... 48 MPH.

DONEY PARK ................. 50 MPH.

WUPATKI NATIONAL MONUMENT... 51 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED

OR OCCURRING...WITH SUSTAINED WIND SPEEDS GREATER THAN 40 MPH OR

GUSTS GREATER THAN 58 MPH. WINDS THIS STRONG CAN CAUSE PROPERTY

DAMAGE. CONTINUE TO MONITOR THE LATEST FORECASTS. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ013-014-016-017-040-040145-
143

/O.CON.KFGZ.HW.W.0004.000000T0000Z-090404T0700Z/

LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTYLITTLE COLORADO RIVER VALLEY IN APACHE COUNTYEASTERN MOGOLLON RIM-WHITE MOUNTAINSNORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264-

INCLUDING THE CITIES OF...WINSLOW...HOLBROOK...SNOWFLAKE...

ST. JOHNS...SPRINGERVILLE...HEBER...HAPPY JACK...FOREST LAKES...

SHOW LOW...GREER...PINETOP...DILKON...KYKOTSMOVI

1038 AM MST FRI APR 3 2009

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST

TONIGHT...

A HIGH WIND WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND OF

STRONG WINDS TODAY. SOUTHWEST WINDS OF 35 TO 50 MPH WITH GUSTS UP

TO 65 MPH WILL CONTINUE TO OCCUR THROUGH THIS EVENING. AREAS OF

BLOWING DUST CAN BE EXPECTED...CREATING POOR TRAVEL CONDITIONS DUE

TO LIMITED VISIBILITY.

PEAK WIND GUSTS REPORTED AS OF 10 AM MST THIS MORNING INCLUDE...

WINSLOW .................... 69 MPH.

SHOW LOW ................... 47 MPH.

SAINT JOHNS ................ 53 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED

OR OCCURRING...WITH SUSTAINED WIND SPEEDS GREATER THAN 40 MPH OR

GUSTS GREATER THAN 58 MPH. WINDS THIS STRONG CAN CAUSE PROPERTY

DAMAGE. CONTINUE TO MONITOR THE LATEST FORECASTS. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ004>006-009-040145-

/O.CON.KFGZ.WI.Y.0009.000000T0000Z-090404T0300Z/

KAIBAB PLATEAU-MARBLE AND GLEN CANYONS-GRAND CANYON COUNTRYNORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARDINCLUDING THE CITIES OF...JACOB LAKE...FREDONIA...PAGE...

LEES FERRY...GRAND CANYON VILLAGE...SUPAI...NORTH RIM...

KEAMS CANYON...KAIBITO

1038 AM MST FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND OF

STRONG WINDS TODAY. SOUTHWEST WINDS OF 25 TO 35 MPH WITH GUSTS OF

45 TO 50 MPH WILL CONTINUE TO OCCUR INTO EARLY THIS EVENING. THERE

IS ALSO THE POTENTIAL FOR AREAS OF BLOWING DUST...CREATING POOR

TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

PEAK WIND GUSTS REPORTED AS OF 10 AM MST THIS MORNING INCLUDE...

GRAND CANYON ................ 45 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ010-011-039-040145-

/O.CON.KFGZ.WI.Y.0009.000000T0000Z-090404T0500Z/

CHINLE VALLEY-CHUSKA MOUNTAINS AND DEFIANCE PLATEAUBLACK MESA AREAINCLUDING THE CITIES OF...CANYON DE CHELLY...CHINLE...KAYENTA...
144

WINDOW ROCK...GANADO...NAVAJO N.M.

1038 AM MST FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 10 PM MST THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 10 PM MST THIS EVENING.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND OF

STRONG WINDS TODAY. SOUTHWEST WINDS OF 25 TO 35 MPH WITH GUSTS OF

45 TO 50 MPH WILL CONTINUE TO OCCUR INTO EARLY THIS EVENING. THERE

IS ALSO THE POTENTIAL FOR AREAS OF BLOWING DUST...CREATING POOR

TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

PEAK WIND GUSTS REPORTED AS OF 10 AM MST THIS MORNING INCLUDE...

WINDOW ROCK ................ 43 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ008-018-037-038-040145-

/O.CON.KFGZ.WI.Y.0009.000000T0000Z-090404T0300Z/

YAVAPAI COUNTY MOUNTAINS-NORTHERN GILA COUNTYYAVAPAI COUNTY VALLEYS AND BASINS-OAK CREEK AND SYCAMORE CANYONSINCLUDING THE CITIES OF...PRESCOTT...SELIGMAN...ASH FORK...

PAYSON...STRAWBERRY...YOUNG...COTTONWOOD...CAMP VERDE...

CORDES JUNCTION...BAGDAD...SEDONA

1038 AM MST FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND OF

STRONG WINDS TODAY. SOUTHWEST WINDS OF 25 TO 35 MPH WITH GUSTS OF

45 TO 55 MPH WILL CONTINUE TO OCCUR INTO EARLY THIS EVENING. THERE

IS ALSO THE POTENTIAL FOR AREAS OF BLOWING DUST...CREATING POOR

TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

PEAK WIND GUSTS REPORTED AS OF 10 AM MST THIS MORNING INCLUDE...

PRESCOTT ................ 60 MPH.

SELIGMAN ................ 47 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

WWUS75 KFGZ 032150

NPWFGZ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE FLAGSTAFF AZ

250 PM MST FRI APR 3 2009

AZZ007-012-015-040300-

/O.CON.KFGZ.HW.W.0004.000000T0000Z-090404T0300Z/

COCONINO PLATEAU-LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTYWESTERN MOGOLLON RIMINCLUDING THE CITIES OF...VALLE...WUPATKI N.M....TUBA CITY...

FLAGSTAFF...WILLIAMS...MUNDS PARK

250 PM MST FRI APR 3 2009

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS
145

EVENING...

A HIGH WIND WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS

EVENING.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND

OF STRONG WINDS TODAY. SOUTHWEST WINDS OF 30 TO 45 MPH WITH GUSTS

UP TO AROUND 65 MPH WILL CONTINUE TO OCCUR INTO EARLY THIS

EVENING. AREAS OF BLOWING DUST CAN BE EXPECTED...CREATING VERY

POOR TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY...INCLUDING ALONG

INTERSTATE 40 EAST OF FLAGSTAFF.

PEAK WIND GUSTS REPORTED AS OF 230 PM MST THIS AFTERNOON

INCLUDE...

FLAGSTAFF AIRPORT .......... 51 MPH.

DONEY PARK ................. 51 MPH.

WUPATKI NATIONAL MONUMENT... 54 MPH.

TUBA CITY .................. 55 MPH.

METEOR CRATER .............. 91 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED

OR OCCURRING...WITH SUSTAINED WIND SPEEDS GREATER THAN 40 MPH OR

GUSTS GREATER THAN 58 MPH. WINDS THIS STRONG CAN CAUSE PROPERTY

DAMAGE. CONTINUE TO MONITOR THE LATEST FORECASTS. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ013-014-016-017-040-040600-

/O.CON.KFGZ.HW.W.0004.000000T0000Z-090404T0700Z/

LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTYLITTLE COLORADO RIVER VALLEY IN APACHE COUNTYEASTERN MOGOLLON RIM-WHITE MOUNTAINSNORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264-

INCLUDING THE CITIES OF...WINSLOW...HOLBROOK...SNOWFLAKE...

ST. JOHNS...SPRINGERVILLE...HEBER...HAPPY JACK...FOREST LAKES...

SHOW LOW...GREER...PINETOP...DILKON...KYKOTSMOVI

250 PM MST FRI APR 3 2009

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST

TONIGHT...

A HIGH WIND WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND

OF STRONG WINDS TODAY. SOUTHWEST WINDS OF 35 TO 50 MPH WITH GUSTS

UP TO AROUND 65 MPH WILL CONTINUE TO OCCUR THROUGH THIS EVENING.

AREAS OF BLOWING DUST CAN BE EXPECTED...CREATING VERY POOR TRAVEL

CONDITIONS DUE TO LIMITED VISIBILITY...INCLUDING ALONG INTERSTATE

40 BETWEEN WINSLOW AND THE NEW MEXICO BORDER.

PEAK WIND GUSTS REPORTED AS OF 230 PM MST THIS AFTERNOON

INCLUDE...

WINSLOW .................... 69 MPH.

SHOW LOW ................... 49 MPH.

SAINT JOHNS ................ 61 MPH.

SANDERS .................... 68 MPH.

PETRIFIED FOREST ........... 60 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED

OR OCCURRING...WITH SUSTAINED WIND SPEEDS GREATER THAN 40 MPH OR

GUSTS GREATER THAN 58 MPH. WINDS THIS STRONG CAN CAUSE PROPERTY

DAMAGE. CONTINUE TO MONITOR THE LATEST FORECASTS. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ004>006-009-040300-
146

/O.CON.KFGZ.WI.Y.0009.000000T0000Z-090404T0300Z/

KAIBAB PLATEAU-MARBLE AND GLEN CANYONS-GRAND CANYON COUNTRYNORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARDINCLUDING THE CITIES OF...JACOB LAKE...FREDONIA...PAGE...

LEES FERRY...GRAND CANYON VILLAGE...SUPAI...NORTH RIM...

KEAMS CANYON...KAIBITO

250 PM MST FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND

OF STRONG WINDS TODAY. SOUTHWEST WINDS OF 25 TO 35 MPH WITH GUSTS

OF 45 TO 55 MPH WILL CONTINUE TO OCCUR INTO EARLY THIS EVENING.

THERE IS ALSO THE POTENTIAL FOR AREAS OF BLOWING DUST...CREATING

POOR TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

PEAK WIND GUSTS REPORTED AS OF 230 PM MST THIS AFTERNOON

INCLUDE...

GRAND CANYON ................ 55 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ010-011-039-040500-

/O.CON.KFGZ.WI.Y.0009.000000T0000Z-090404T0500Z/

CHINLE VALLEY-CHUSKA MOUNTAINS AND DEFIANCE PLATEAUBLACK MESA AREAINCLUDING THE CITIES OF...CANYON DE CHELLY...CHINLE...KAYENTA...

WINDOW ROCK...GANADO...NAVAJO N.M.

250 PM MST FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 10 PM MST THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 10 PM MST THIS EVENING.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND

OF STRONG WINDS TODAY. SOUTHWEST WINDS OF 25 TO 35 MPH WITH GUSTS

OF 45 TO 50 MPH WILL CONTINUE TO OCCUR INTO EARLY THIS EVENING.

THERE IS ALSO THE POTENTIAL FOR AREAS OF BLOWING DUST...CREATING

POOR TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

PEAK WIND GUSTS REPORTED AS OF 230 PM MST THIS AFTERNOON

INCLUDE...

WINDOW ROCK ................ 54 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ008-018-037-038-040300-

/O.CON.KFGZ.WI.Y.0009.000000T0000Z-090404T0300Z/

YAVAPAI COUNTY MOUNTAINS-NORTHERN GILA COUNTYYAVAPAI COUNTY VALLEYS AND BASINS-OAK CREEK AND SYCAMORE CANYONSINCLUDING THE CITIES OF...PRESCOTT...SELIGMAN...ASH FORK...

PAYSON...STRAWBERRY...YOUNG...COTTONWOOD...CAMP VERDE...

CORDES JUNCTION...BAGDAD...SEDONA

250 PM MST FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING...
147

A WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND

OF STRONG WINDS TODAY. SOUTHWEST WINDS OF 25 TO 35 MPH WITH GUSTS

OF 45 TO 55 MPH WILL CONTINUE TO OCCUR INTO EARLY THIS EVENING.

THERE IS ALSO THE POTENTIAL FOR AREAS OF BLOWING DUST...CREATING

POOR TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

PEAK WIND GUSTS REPORTED AS OF 230 PM MST THIS AFTERNOON

INCLUDE...

PRESCOTT ................ 60 MPH.

SELIGMAN ................ 71 MPH.

SEDONA .................. 51 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

WWUS75 KFGZ 032150

NPWFGZ

URGENT - WEATHER MESSAGE

NATIONAL WEATHER SERVICE FLAGSTAFF AZ

250 PM MST FRI APR 3 2009

AZZ007-012-015-040300-

/O.CON.KFGZ.HW.W.0004.000000T0000Z-090404T0300Z/

COCONINO PLATEAU-LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTYWESTERN MOGOLLON RIMINCLUDING THE CITIES OF...VALLE...WUPATKI N.M....TUBA CITY...

FLAGSTAFF...WILLIAMS...MUNDS PARK

250 PM MST FRI APR 3 2009

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS

EVENING...

A HIGH WIND WARNING REMAINS IN EFFECT UNTIL 8 PM MST THIS

EVENING.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND

OF STRONG WINDS TODAY. SOUTHWEST WINDS OF 30 TO 45 MPH WITH GUSTS

UP TO AROUND 65 MPH WILL CONTINUE TO OCCUR INTO EARLY THIS

EVENING. AREAS OF BLOWING DUST CAN BE EXPECTED...CREATING VERY

POOR TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY...INCLUDING ALONG

INTERSTATE 40 EAST OF FLAGSTAFF.

PEAK WIND GUSTS REPORTED AS OF 230 PM MST THIS AFTERNOON

INCLUDE...

FLAGSTAFF AIRPORT .......... 51 MPH.

DONEY PARK ................. 51 MPH.

WUPATKI NATIONAL MONUMENT... 54 MPH.

TUBA CITY .................. 55 MPH.

METEOR CRATER .............. 91 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED

OR OCCURRING...WITH SUSTAINED WIND SPEEDS GREATER THAN 40 MPH OR

GUSTS GREATER THAN 58 MPH. WINDS THIS STRONG CAN CAUSE PROPERTY

DAMAGE. CONTINUE TO MONITOR THE LATEST FORECASTS. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ013-014-016-017-040-040600-

/O.CON.KFGZ.HW.W.0004.000000T0000Z-090404T0700Z/
148

LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTYLITTLE COLORADO RIVER VALLEY IN APACHE COUNTYEASTERN MOGOLLON RIM-WHITE MOUNTAINSNORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264-

INCLUDING THE CITIES OF...WINSLOW...HOLBROOK...SNOWFLAKE...

ST. JOHNS...SPRINGERVILLE...HEBER...HAPPY JACK...FOREST LAKES...

SHOW LOW...GREER...PINETOP...DILKON...KYKOTSMOVI

250 PM MST FRI APR 3 2009

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST

TONIGHT...

A HIGH WIND WARNING REMAINS IN EFFECT UNTIL MIDNIGHT MST TONIGHT.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND

OF STRONG WINDS TODAY. SOUTHWEST WINDS OF 35 TO 50 MPH WITH GUSTS

UP TO AROUND 65 MPH WILL CONTINUE TO OCCUR THROUGH THIS EVENING.

AREAS OF BLOWING DUST CAN BE EXPECTED...CREATING VERY POOR TRAVEL

CONDITIONS DUE TO LIMITED VISIBILITY...INCLUDING ALONG INTERSTATE

40 BETWEEN WINSLOW AND THE NEW MEXICO BORDER.

PEAK WIND GUSTS REPORTED AS OF 230 PM MST THIS AFTERNOON

INCLUDE...

WINSLOW .................... 69 MPH.

SHOW LOW ................... 49 MPH.

SAINT JOHNS ................ 61 MPH.

SANDERS .................... 68 MPH.

PETRIFIED FOREST ........... 60 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS A HAZARDOUS HIGH WIND EVENT IS EXPECTED

OR OCCURRING...WITH SUSTAINED WIND SPEEDS GREATER THAN 40 MPH OR

GUSTS GREATER THAN 58 MPH. WINDS THIS STRONG CAN CAUSE PROPERTY

DAMAGE. CONTINUE TO MONITOR THE LATEST FORECASTS. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ004>006-009-040300-

/O.CON.KFGZ.WI.Y.0009.000000T0000Z-090404T0300Z/

KAIBAB PLATEAU-MARBLE AND GLEN CANYONS-GRAND CANYON COUNTRYNORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARDINCLUDING THE CITIES OF...JACOB LAKE...FREDONIA...PAGE...

LEES FERRY...GRAND CANYON VILLAGE...SUPAI...NORTH RIM...

KEAMS CANYON...KAIBITO

250 PM MST FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND

OF STRONG WINDS TODAY. SOUTHWEST WINDS OF 25 TO 35 MPH WITH GUSTS

OF 45 TO 55 MPH WILL CONTINUE TO OCCUR INTO EARLY THIS EVENING.

THERE IS ALSO THE POTENTIAL FOR AREAS OF BLOWING DUST...CREATING

POOR TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

PEAK WIND GUSTS REPORTED AS OF 230 PM MST THIS AFTERNOON

INCLUDE...

GRAND CANYON ................ 55 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ010-011-039-040500-
149

/O.CON.KFGZ.WI.Y.0009.000000T0000Z-090404T0500Z/

CHINLE VALLEY-CHUSKA MOUNTAINS AND DEFIANCE PLATEAUBLACK MESA AREAINCLUDING THE CITIES OF...CANYON DE CHELLY...CHINLE...KAYENTA...

WINDOW ROCK...GANADO...NAVAJO N.M.

250 PM MST FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 10 PM MST THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 10 PM MST THIS EVENING.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND

OF STRONG WINDS TODAY. SOUTHWEST WINDS OF 25 TO 35 MPH WITH GUSTS

OF 45 TO 50 MPH WILL CONTINUE TO OCCUR INTO EARLY THIS EVENING.

THERE IS ALSO THE POTENTIAL FOR AREAS OF BLOWING DUST...CREATING

POOR TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

PEAK WIND GUSTS REPORTED AS OF 230 PM MST THIS AFTERNOON

INCLUDE...

WINDOW ROCK ................ 54 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$

AZZ008-018-037-038-040300-

/O.CON.KFGZ.WI.Y.0009.000000T0000Z-090404T0300Z/

YAVAPAI COUNTY MOUNTAINS-NORTHERN GILA COUNTYYAVAPAI COUNTY VALLEYS AND BASINS-OAK CREEK AND SYCAMORE CANYONSINCLUDING THE CITIES OF...PRESCOTT...SELIGMAN...ASH FORK...

PAYSON...STRAWBERRY...YOUNG...COTTONWOOD...CAMP VERDE...

CORDES JUNCTION...BAGDAD...SEDONA

250 PM MST FRI APR 3 2009

...WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING...

A WIND ADVISORY REMAINS IN EFFECT UNTIL 8 PM MST THIS EVENING.

A STORM SYSTEM APPROACHING THE REGION IS BRINGING ANOTHER ROUND

OF STRONG WINDS TODAY. SOUTHWEST WINDS OF 25 TO 35 MPH WITH GUSTS

OF 45 TO 55 MPH WILL CONTINUE TO OCCUR INTO EARLY THIS EVENING.

THERE IS ALSO THE POTENTIAL FOR AREAS OF BLOWING DUST...CREATING

POOR TRAVEL CONDITIONS DUE TO LIMITED VISIBILITY.

PEAK WIND GUSTS REPORTED AS OF 230 PM MST THIS AFTERNOON

INCLUDE...

PRESCOTT ................ 60 MPH.

SELIGMAN ................ 71 MPH.

SEDONA .................. 51 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY MEANS THAT SUSTAINED WINDS OF 30 TO 39 MPH...OR

GUSTS FROM 40 TO 57 MPH...ARE EXPECTED. WINDS THIS STRONG CAN

MAKE DRIVING DIFFICULT...ESPECIALLY FOR HIGH PROFILE VEHICLES.

CONSIDER SECURING LOOSE BELONGINGS ON YOUR PROPERTY. ADDITIONAL

WEATHER INFORMATION IS ON THE WEB AT WEATHER.GOV/FLAGSTAFF.

&&

$$