An intense upper level jet stream combined with a series of upper level weather disturbances produced an extended period of very strong and gusty westerly winds throughout southeast Wyoming.  There were numerous reports of sustained winds of 35 to 55 mph with frequent gusts of 60 to 90 mph.  These high winds resulted in several jackknifed semi-trucks along portions of Interstates 25 and 80 south and west of Cheyenne.  About 1,500 Cheyenne residents were without power, as well as other small communities in southeast Wyoming on December 29.  The high winds uprooted several large pine trees, and transformed a small grass fire near Pine Bluffs into a raging inferno, which scorched 2,000 acres.

High Wind in SHIRLEY BASIN, WYOMING
From 29-DEC-11 04:26:00 to 29-DEC-11 16:11:00 (MST-7)
Magnitude: 65.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Arlington measured sustained winds of 40 mph or greater, with a peak gust of 79 mph at 29/1411L.

High Wind in FERRIS/SEMINOE/SHIRLEY MOUNTAINS, WYOMING
From 28-DEC-11 18:50:00 to 29-DEC-11 15:50:00 (MST-7)
Magnitude: 67.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

A RAWS site near Muddy Gap measured sustained winds of 40 mph or greater, with a peak gust of 77 mph at 29/1050L.

High Wind in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 29-DEC-11 04:26:00 to 29-DEC-11 16:11:00 (MST-7)
Magnitude: 69.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Arlington measured sustained winds of 40 mph or greater, with a peak gust of 79 mph at 29/1411L.  Two semi-trucks were blown over on Interstate 80 at mileposts 287 and 288.  No injuries were reported.

High Wind in SOUTH LARAMIE RANGE FOOTHILLS, WYOMING
From 29-DEC-11 05:40:00 to 29-DEC-11 16:20:00 (MST-7)
Magnitude: 71.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Whitaker measured sustained winds of 40 mph or greater, with a peak gust of 82 mph at 29/1330L.

High Wind in SOUTH LARAMIE RANGE FOOTHILLS, WYOMING
From 29-DEC-11 05:41:00 to 29-DEC-11 15:26:00 (MST-7)
Magnitude: 64.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Wyoming Hill measured sustained winds of 40 mph or greater, with a peak gust of 74 mph at 29/0611L.  The high winds blew over three semi-trucks on Interstate 25 south of Cheyenne, between mileposts 4.2 and 4.5.  No injuries were reported.

High Wind in CENTRAL LARAMIE COUNTY, WYOMING
From 29-DEC-11 06:53:00 to 29-DEC-11 15:53:00 (MST-7)
Magnitude: 67.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The wind sensor at the Cheyenne measured sustained winds of 40 mph or greater, with a peak gust of 77 mph at 29/1506L.

High Wind in LARAMIE VALLEY, WYOMING
From 29-DEC-11 07:51:00 to 29-DEC-11 17:50:00 (MST-7)
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Herrick Lane measured sustained winds of 40 mph or greater, with a peak gust of 71 mph at 29/1436L.

High Wind in LARAMIE VALLEY, WYOMING
From 29-DEC-11 08:53:00 to 29-DEC-11 17:53:00 (MST-7)
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The wind sensor at the Laramie Airport measured sustained winds of 40 mph or greater, with a peak gust of 67 mph at 29/0853L.

High Wind in CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY, WYOMING
From 29-DEC-11 09:05:00 to 29-DEC-11 15:15:00 (MST-7)
Magnitude: 69.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Bordeaux measured sustained winds of 40 mph or greater, with a peak gust of 79 mph at 29/1505L.

High Wind in EAST PLATTE COUNTY, WYOMING
From 29-DEC-11 09:05:00 to 29-DEC-11 15:15:00 (MST-7)
Magnitude: 69.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Bordeaux measured sustained winds of 40 mph or greater, with a peak gust of 79 mph at 29/1505L.

High Wind in CONVERSE COUNTY LOWER ELEVATIONS, WYOMING
From 29-DEC-11 11:16:00 to 29-DEC-11 11:16:00 (MST-7)
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The wind sensor at the Douglas Airport measured a gust of 59 mph.

High Wind in NORTH LARAMIE RANGE, WYOMING
From 29-DEC-11 11:44:00 to 29-DEC-11 16:44:00 (MST-7)
Magnitude: 64.00 MS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The RAWS site at Dodge Creek measured sustained winds of 40 mph or greater, with a peak gust of 74 mph at 29/1244L.

High Wind in CENTRAL CARBON COUNTY, WYOMING
From 29-DEC-11 12:25:00 to 29-DEC-11 14:35:00 (MST-7)
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Sinclair measured sustained winds of 40 mph or greater, with a peak gust of 63 mph at 29/1250L.

High Wind in EAST LARAMIE COUNTY, WYOMING
From 29-DEC-11 12:40:00 to 29-DEC-11 15:40:00 (MST-7)
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Gun Barrel measured sustained winds of 40 mph or greater, with a peak gust of 69 mph at 29/1415L.  The high winds spread a small grass fire at the intersection of County Roads 158 and 210 near Pine Bluffs.  The fire consumed 2,000 acres and lasted nearly four hours before it was extinguished.  A shed and horse barn were damaged, but no injuries were reported.

High Wind in CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY, WYOMING
From 28-DEC-11 16:15:00 to 28-DEC-11 17:35:00 (MST-7)
Magnitude: 35.00 MS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Bordeaux measured sustained winds of 40 mph or greater, with a peak gust of 62 mph at 28/1645L.

High Wind in EAST PLATTE COUNTY, WYOMING
From 28-DEC-11 16:15:00 to 28-DEC-11 17:35:00 (MST-7)
Magnitude: 35.00 MS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Bordeaux measured sustained winds of 40 mph or greater, with a peak gust of 62 mph at 28/1645L.

High Wind in CENTRAL CARBON COUNTY, WYOMING
From 29-DEC-11 12:53:00 to 29-DEC-11 14:53:00 (MST-7)
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The wind sensor at the Rawlins Airport measured sustained winds of 40 mph or greater, with a peak gust of 63 mph at 29/1253L.

High Wind in CENTRAL CARBON COUNTY, WYOMING
From 29-DEC-11 11:36:00 to 29-DEC-11 12:51:00 (MST-7)
Magnitude: 35.00 MS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Walcott Junction measured sustained winds of 40 mph or greater, with a peak gust of 60 mph at 29/1241L.

High Wind in SOUTH LARAMIE RANGE, WYOMING
From 29-DEC-11 00:45:00 to 29-DEC-11 16:55:00 (MST-7)
Magnitude: 35.00 MS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The UPR site at Lynch measured sustained winds of 40 mph or greater, with a peak gust of 75 mph at 29/0430L.

High Wind in SOUTH LARAMIE RANGE FOOTHILLS, WYOMING
From 29-DEC-11 15:04:00 to 29-DEC-11 15:04:00 (MST-7)
Magnitude: 78.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A gust of 90 mph was reported 12 miles south-southeast of Horsecreek.

High Wind in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 27-DEC-11 09:26:00 to 27-DEC-11 15:10:00 (MST-7)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Arlington measured sustained winds of 40 mph or greater, with a peak gust of 65 mph at 27/0936L.

High Wind in CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY, WYOMING
From 28-DEC-11 05:05:00 to 28-DEC-11 13:50:00 (MST-7)
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Bordeaux measured sustained winds of 40 mph or greater, with a peak gust of 71 mph at 28/0755L.

High Wind in NORTH LARAMIE RANGE, WYOMING
From 28-DEC-11 09:44:00 to 28-DEC-11 13:44:00 (MST-7)
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The RAWS site at Dodge Creek measured sustained winds of 40 mph or greater, with a peak gust of 73 mph at 28/1144L.

High Wind in SOUTH LARAMIE RANGE, WYOMING
From 28-DEC-11 09:55:00 to 28-DEC-11 13:30:00 (MST-7)
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The UPR site at Lynch measured sustained winds of 40 mph or greater, with a peak gust of 63 mph at 28/1145L.