Widespread strong winds developed across the wind prone areas of southeast Wyoming late in the evening on the 20th. In the early morning hours on the 21st, a severe mountain wave developed over the Southern Laramie Range, resulting in a sharp increase in wind speeds into the I-25 corridor including the city of Cheyenne. Sustained winds at the Cheyenne Airport reached nearly 60 MPH with gusts over 75 MPH for several hours with occasional gusts up to 65 MPH continuing well into the morning and afternoon on the 21st. Winds remained elevated for much of the area into the overnight hours, ending prior to sunrise on the 22nd. High winds resulted in road closures to light weight and high profile vehicles as well as minor tree and property damage.

High Wind in CENTRAL LARAMIE COUNTY, WYOMING
From 21-DEC-21 01:46:00 to 21-DEC-21 13:06:00 (MST-7)
Magnitude: 69.00 MG
Reported by: ASOS

A severe mountain wave resulted in a prolonged period of extreme winds sustained at 50+ MPH with gusts up to 79 MPH at the Cheyenne (KCYS) ASOS, peaking at 3:30 AM MST. Winds remained strong through around 7:00 AM before decreasing slightly, but occasional gusts exceeding 60 MPH continued into the early afternoon.

High Wind in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 20-DEC-21 20:04:00 to 22-DEC-21 13:18:00 (MST-7)
Magnitude: 56.00 MG
Reported by: Department of Highways

A prolonged period of strong winds with frequent gusts 60-65 MPH was observed at multiple WYDOT sensors along Interstate 80 between Laramie and Rawlins. The peak wind gust was 65 MPH at Strouss Hill (WY25) at 8:34 PM MST on 12/20.

High Wind in CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY, WYOMING
From 20-DEC-21 20:00:00 to 21-DEC-21 10:59:00 (MST-7)
Magnitude: 64.00 MG
Reported by: Department of Highways

Frequent wind gusts 60+ MPH observed along Interstate 25 between Chugwater and Wheatland per the WYDOT sensor at the Bordeaux Interchange (KBRX). Peak wind gust was 74 MPH at 9:52 PM MST on 12/20.

High Wind in SOUTH LARAMIE RANGE, WYOMING
From 20-DEC-21 20:20:00 to 22-DEC-21 13:34:00 (MST-7)
Magnitude: 66.00 MG
Reported by: Department of Highways

Frequent wind gusts 60-70 MPH were recorded by several WYDOT and UPR sensors over the southern Laramie Range including Interstate 80 between Laramie and Cheyenne. The peak wind gust was 76 MPH at Wildcat Trail (WY48) at 11:38 PM MST on 12/21.

High Wind in SOUTH LARAMIE RANGE FOOTHILLS, WYOMING
From 20-DEC-21 22:40:00 to 22-DEC-21 00:14:00 (MST-7)
Magnitude: 67.00 MG
Reported by: Department of Highways

Multiple WYDOT and UPR sensors across the South Laramie Range Foothills recorded wind gusts 60-70+ MPH. The peak wind gust was 77 MPH at the EMKAY UPR (UP226) at 10:09 AM MST on 12/21.

High Wind in CONVERSE COUNTY LOWER ELEVATIONS, WYOMING
From 20-DEC-21 21:19:00 to 21-DEC-21 00:45:00 (MST-7)
Magnitude: 53.00 MG
Reported by: Mesonet

A brief period of wind gusts around 60 MPH was observed near Douglas during the late evening hours on 12/20. The peak wind gust was 61 MPH at the DW7426 CWOP station at 9:19 PM MST on 12/20.

High Wind in EAST PLATTE COUNTY, WYOMING
From 20-DEC-21 23:58:00 to 21-DEC-21 02:52:00 (MST-7)
Magnitude: 55.00 MG
Reported by: Department of Highways

The Coleman (WY1) WYDOT sensor along I-25 south of Glendo recorded frequent wind gusts around 60 MPH for several hours early in the morning on 12/21. The peak wind gust was 63 MPH at 12:02 AM MST.

High Wind in CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY, WYOMING
From 21-DEC-21 20:03:00 to 22-DEC-21 04:22:00 (MST-7)
Magnitude: 61.00 MG
Reported by: Department of Highways

A second round of high winds occurred near Bordeaux along Interstate 25 between Chugwater and Wheatland. The peak wind gust during this period was 70 MPH at the Bordeaux (KBRX) WYDOT sensor at 8:16 PM MST.