# Presentation: 565310

## The Use of NWS Frost Depth Gauges to acquire frost depth information in Wisconsin

## 34 Frost depth gauge sites.  29 at COOP and UCOOP sites – 5 at WIS-DOT sites

## Purpose, benefits, drawbacks to frost depth gauge program

-  **Purpose** – to secure accurate and reliable frost depth information on a systematic basis from trained observers.
-  **Benefits** – more reliable data gathering method than trying to secure information from grave diggers, utility companies, etc.  Low cost, low maintenance, observers like them.  Data goes into AWIPS database through WXCODER in SHEF format.   SHEF code is GD.
**Drawbacks** – no known supply of gauges, gauges have to be built locally, can be difficult to install.

## Source of supplies, costs

- Components to build frost depth gages and their covers can be purchased at local hardware stores - PVC pieces, clear plastic tubing, etc.  Complete list of components, diagram, and construction details in Mark Walton’s 1998 paper “**Flood Forecasting & Frost Depth**”.
- Total cost of components to build 1 frost depth gage and a cover- $20.00 - $30.00

## My strategy for installation

- Have 3 lengths of frost depth gages available:  3 ft, 4 1⁄2 ft, 6 feet.
- -Goal is to install a 6 foot gauge, if possible
- - If unable to install a 6 foot gauge due to obstructions, etc., then install a shorter one.

## Tools used to install- power soil auger

## Tools used to install-manual soil auger

## Frost depth gage being installed near other NWS equipment

## Frost depth gage installed – with PVC cover.  Note: flagged location marker

## Frost depth gage with other NWS equipment

## Training the observer how to read frost depth gage

## Example of observer reading frost depth gauge

## Instructions for frost depth observers

**Nov. 1 - April  30**  - report frost depth (depth of frost penetration) twice a week normally on **Monday** mornings (or the next available day) and **Thursday** mornings (or the next available day).   If there is no frost penetration, report 0 inches of frost depth.   Frost depth is reported to the nearest whole inch.  If you estimate the frost depth penetration is 2.5 inches, report 3 inches.
**Jan. 1 – April 30** – report frost depth thawed (**in addition to frost depth** - on same schedule as above).  If there is no frost depth thawed, report 0.  Only report frost depth thawed if you have 1” or more.  Use same rounding off to next whole inch guidelines as stated above.
- If you have to shovel snow away from the frost depth gage to get to it, please replace the snow approximately the way you found it...to simulate the natural conditions in the area of the gauge.
- If you are unable to use Weather Coder for any reason, call NWS-Green Bay (1-800-788-6883 ext. 468) with your report.  Tell them your ID first
-  (**LKSW3**).
- If possible, reports should be sent in Weather Coder no later than 830 am (anytime between 5 am and 830 am).
- Go to the proper sections to report frost depth penetration and depth of frost thawed.  See the ? buttons for assistance.

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|  |  | Location: | Oconomowoc South, WI (ONCW3) | Type of observation: |          |
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| Precipitation |  |  |  |  |
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| Precipitation: |  | x.xx in |        |  |
| Snowfall: |  | x.x in |        |  |
| Snow depth: |  | x in |        |  |
| Snow core: |  | x.x in |        |  |

| Dew & Frost Data |  |  |  |  |
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| Depth of frost penetration: |  | x in |        |  |

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## Frost depth data posted to HYDMKX  product  -  RiverPro

- BELOW IS INFORMATION ABOUT WISCONSIN FROST DEPTHS AS MEASURED BY VOLUNTEERS WITH NWS FROST DEPTH GAGES.  FROST DEPTH MEASUREMENTS ARE REQUESTED A MINIMUM OF TWICE WEEKLY-MONDAY MORNINGS AND THURSDAY MORNINGS NOVEMBER THROUGH APRIL.  DATA ALIGNED APPROXIMATELY FROM NORTH TO SOUTH.   THIS IS AN EXPERIMENTAL PROGRAM.  DATA NOT AVAILABLE FROM ALL AREAS OF THE STATE. COMMENTS ARE WELCOME. CONTACT _[BRIAN.HAHN@NOAA.GOV](mailto:BRIAN.HAHN@NOAA.GOV)__   _
-                                                                      FROST    TIME/DATE OF     TODAY'S
-                                                                      DEPTH     LAST FROST  SNOW DEPTH
-  ID         COUNTY             LOCATION            (IN.)     DEPTH REPORT           (IN.)
- PRQW3    VILAS           PRESQUE ISLE           0    08 AM MON NOV 08          0
- LOKW3    VILAS           LAND O LAKES-10 W  0    08 AM MON NOV 08          0
- LKSW3    VILAS            LAND O LAKES-4 W    0    07 AM MON NOV 08          0
- LGKW3    FLORENCE   LONG LAKE-3 NE       0    05 AM MON NOV 08          0
- ARRW3    FLORENCE   AURORA-4 W             0    09 AM SUN NOV 07          M
- MOLW3    FOREST        MOLE LAKE               0    08 AM MON NOV 08          0

## Once a year maintenance to frost depth gages

- - Remove any moisture that may have collected in the outer tube – sponge on the end of a stick
- - Possibly replace colored water in clear plastic tube – handle can be disassembled
- - General cleaning

**   ****	****     ****Joint project with Wis. Dept. of                    ****	****  ****	****Transportation at 5 sites**
- - Started in Aug.  2004 with the purpose of possibly establishing a correlation between frost depth under snow-free pavement and frost depth under snow-covered grass.
-  DOT wants to know frost depth under pavement for “**Frozen Road** **Declaration**”.  When there are 18” or more of frost under state roads, trucks can temporarily carry heavier loads.
- - NWS frost depth gauge installed at 5 Wis. Highway Maintenance Garages along with a DOT frost depth gauge.  DOT gauges are built by a DOT employee in Madison, WI.
- - DOT personnel make measurements from both gauges on a  regular schedule.  They send reports from the NWS gauge to NWS through WXCODER – same as COOP observers do.
- - Possible expansion of joint network in 2005 and beyond

## Wis DOT soil auger machine

## Wis. DOT soil auger machine

## Wis. DOT soil auger

## NWS Frost depth gauge at DOT site

## DOT soil auger boring a hole in pavement

## Installing DOT frost depth gage in 7 foot hole in pavement

## The End