Very fast winds aloft combined with a steep surface pressure gradient prior to and following the passage of a fast-moving cold front produced very strong and gusty west to northwest winds throughout southeast Wyoming.  Sustained winds of 35 to 55 mph with gusts from 60 to 80 mph were common.  On December 31, there were several reports of blown over semi-trucks on Interstates 80 and 25, however no injuries were reported.  The high winds caused scattered power outages and property damage in the Cheyenne area.  There were seven wind-related injuries in Cheyenne.

High Wind in CONVERSE COUNTY LOWER ELEVATIONS, WYOMING
From 31-DEC-11 09:54:00 to 31-DEC-11 09:54:00 (MST-7)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The wind sensor at the Douglas Airport measured a gust of 64 mph.

High Wind in NIOBRARA COUNTY, WYOMING
From 31-DEC-11 10:04:00 to 31-DEC-11 10:04:00 (MST-7)
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The wind sensor two miles east-southeast of Lusk measured a gust of 63 mph.

High Wind in NORTH LARAMIE RANGE, WYOMING
From 31-DEC-11 08:44:00 to 31-DEC-11 09:44:00 (MST-7)
Magnitude: 52.00 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 60 mph at 31/0844L.

High Wind in FERRIS/SEMINOE/SHIRLEY MOUNTAINS, WYOMING
From 30-DEC-11 13:50:00 to 30-DEC-11 14:50:00 (MST-7)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The RAWS site near Muddy Gap measured sustained winds of 40 mph or greater, with a peak gust of 64 mph at 30/1350L.

High Wind in FERRIS/SEMINOE/SHIRLEY MOUNTAINS, WYOMING
From 31-DEC-11 03:50:00 to 31-DEC-11 06:50:00 (MST-7)
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The RAWS site near Muddy Gap measured sustained winds of 40 mph or greater, with a peak gust of 68 mph at 31/0550L.

High Wind in SHIRLEY BASIN, WYOMING
From 30-DEC-11 09:11:00 to 30-DEC-11 15:26:00 (MST-7)
Magnitude: 58.00 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 67 mph at 30/1011L.

High Wind in SHIRLEY BASIN, WYOMING
From 31-DEC-11 06:21:00 to 31-DEC-11 09:46:00 (MST-7)
Magnitude: 67.00 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 77 mph at 31/0731L.

High Wind in CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY, WYOMING
From 30-DEC-11 09:20:00 to 30-DEC-11 15:15:00 (MST-7)
Magnitude: 60.00 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 69 mph at 30/1300L.

High Wind in CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY, WYOMING
From 31-DEC-11 07:20:00 to 31-DEC-11 11:10:00 (MST-7)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Bordeaux measured sustained winds of 40 mph or greater, with a peak gust of 65 mph at 31/1055L.

High Wind in EAST PLATTE COUNTY, WYOMING
From 30-DEC-11 09:20:00 to 30-DEC-11 15:15:00 (MST-7)
Magnitude: 60.00 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 69 mph at 30/1300L.

High Wind in EAST PLATTE COUNTY, WYOMING
From 31-DEC-11 07:20:00 to 31-DEC-11 11:10:00 (MST-7)
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Bordeaux measured sustained winds of 40 mph or greater, with a peak gust of 65 mph at 31/1055L.

High Wind in GOSHEN COUNTY, WYOMING
From 31-DEC-11 10:35:00 to 31-DEC-11 11:18:00 (MST-7)
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The wind sensor at the Torrington Airport measured a peak gust of 69 mph at 31/1112L.

High Wind in CENTRAL CARBON COUNTY, WYOMING
From 31-DEC-11 06:53:00 to 31-DEC-11 08:53:00 (MST-7)
Magnitude: 56.00 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 65 mph at 31/0653L.

High Wind in CENTRAL CARBON COUNTY, WYOMING
From 31-DEC-11 05:41:00 to 31-DEC-11 08:31:00 (MST-7)
Magnitude: 56.00 MG
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 64 mph at 31/0816L.

High Wind in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 30-DEC-11 09:11:00 to 30-DEC-11 15:16:00 (MST-7)
Magnitude: 58.00 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 67 mph at 30/1011L.

High Wind in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 31-DEC-11 06:21:00 to 31-DEC-11 09:46:00 (MST-7)
Magnitude: 67.00 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 77 mph at 31/0731L.

High Wind in SOUTHWEST CARBON COUNTY, WYOMING
From 31-DEC-11 06:31:00 to 31-DEC-11 08:06:00 (MST-7)
Magnitude: 35.00 MS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site west of Rawlins measured sustained winds of 40 mph or greater, with a peak gust of 58 mph at 31/0721L.

High Wind in SNOWY RANGE, WYOMING
From 31-DEC-11 04:52:00 to 31-DEC-11 04:52:00 (MST-7)
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: RAWS

The RAWS site at Sawmill Park measured a gust of 58 mph.

High Wind in LARAMIE VALLEY, WYOMING
From 31-DEC-11 07:11:00 to 31-DEC-11 10:36:00 (MST-7)
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Quealy Dome measured sustained winds of 40 mph or greater, with a peak gust of 63 mph at 31/0811L.

High Wind in SOUTH LARAMIE RANGE, WYOMING
From 31-DEC-11 06:45:00 to 31-DEC-11 11:45:00 (MST-7)
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The UPR site at Lynch measured sustained winds of 40 mpp or greater, with a peak gust of 71 mph at 31/1045L.

High Wind in SOUTH LARAMIE RANGE FOOTHILLS, WYOMING
From 31-DEC-11 06:05:00 to 31-DEC-11 11:05:00 (MST-7)
Magnitude: 62.00 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 71 mph at 31/1010L.

High Wind in SOUTH LARAMIE RANGE, WYOMING
From 31-DEC-11 07:47:00 to 31-DEC-11 12:12:00 (MST-7)
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The WYDOT site at Vedauwoo measured sustained winds of 40 mph or greater, with a peak gust of 70 mph at 31/0812L.

High Wind in SOUTH LARAMIE RANGE FOOTHILLS, WYOMING
From 31-DEC-11 08:41:00 to 31-DEC-11 12:11:00 (MST-7)
Magnitude: 63.00 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 73 mph at 31/1026L.

High Wind in EAST LARAMIE COUNTY, WYOMING
From 31-DEC-11 09:05:00 to 31-DEC-11 11:45:00 (MST-7)
Magnitude: 52.00 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 60 mph at 31/1135L.

High Wind in EAST LARAMIE COUNTY, WYOMING
From 31-DEC-11 09:45:00 to 31-DEC-11 12:15:00 (MST-7)
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

The AWOS site at Pine Bluffs measured sustained winds of 40 mph or greater, with a peak gust of 71 mph at 31/1155L.

High Wind in CENTRAL LARAMIE COUNTY, WYOMING
From 31-DEC-11 08:53:00 to 31-DEC-11 11:53:00 (MST-7)
Magnitude: 66.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The wind sensor at the Cheyenne Regional Airport measured sustained winds of 40 mph or greater, with a peak gust of 76 mph at 31/1004L.  The high winds were responsible for scattered power outages and property damage.  Several large trees were uprooted, with a few on parked vehicles and houses.  Just before 1100L, parts of the roof were blown off the Sam's Club in Cheyenne.  Two persons were injured when they were struck by roof tiles in the parking lot.  Five other persons were treated for minor wind-related injuries.  Several Cheyenne businesses lost signs due to the strong wind gusts.