After recent snowfall earlier in the week, strong winds spread across much of southeast Wyoming resulting in widespread blowing snow and blizzard conditions in spots. Portions of Interstates 25 and 80 were closed for an extended period of time due to winter conditions and crashes.

Blizzard in CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY, WYOMING
From 11-DEC-21 02:58:00 to 11-DEC-21 07:56:00 (MST-7)
Reported by: Department of Highways

WYDOT mesonet station Bordeaux (KBRX) along Interstate 25 measured wind gusts 60 to 80 MPH and visibility around one-quarter mile in blowing snow during this time 9 miles south of Wheatland. Maximum wind gust of 88 MPH was recorded at 7:34 AM MST. Interstate 25 between Cheyenne and Wheatland was closed due to winter conditions for almost 36 hours from 12:55 AM MST on the 11th through 12:33 PM MST on the 12th.

Blizzard in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 10-DEC-21 20:16:00 to 11-DEC-21 04:50:00 (MST-7)
Reported by: Department of Highways

WYDOT mesonet stations Arlington (KARL) and Cooper Cover (WY24) along Interstate 80 measured wind gust 40 to 70 MPH with visibility below one-quarter mile in blowing snow during this period. Interstate 80 between Laramie and Rawlins was closed due to winter conditions for over 40 hours from 12:01 AM MST on the 11th through 4:06 PM MST on the 12th.

Blizzard in CENTRAL CARBON COUNTY, WYOMING
From 11-DEC-21 08:00:00 to 11-DEC-21 11:00:00 (MST-7)
Reported by: Law Enforcement

State/County Troopers reported whiteout conditions along Interstate 80 near the town of Rawlins. Observations from nearby ASOS station at Rawlins Airport (KRWL) reported wind gusts 40 to 50 MPH during this time.

High Wind in CENTRAL CARBON COUNTY, WYOMING
From 12-DEC-21 08:16:00 to 12-DEC-21 09:05:00 (MST-7)
Magnitude: 52.00 MG
Reported by: Department of Highways

WYDOT mesonet station Sinclair (WY14) along Interstate 80 and Union Pacific Railroad mesonet station HADSL1 (UP251) 9 miles west of Rawlins reported high winds. UPR mesonet staion HADSL1 measured maximum wind gust at 9:00 AM MST on the 12th.

High Wind in CONVERSE COUNTY LOWER ELEVATIONS, WYOMING
From 11-DEC-21 09:53:00 to 12-DEC-21 12:18:00 (MST-7)
Magnitude: 54.00 MG
Reported by: Department of Highways

WYDOT mesonet station Deer Creek (KDRC) along Interstate 25 south of Glenrock and CWOP mesonet station near Douglas reported high winds. WYDOT mesonet station Deer Creek measured maximum wind gust at 12:26 PM MST on the 11th. Interstate 25 between Douglas and Casper was closed to light, high-profile vehicles for over 36 hours.

High Wind in FERRIS/SEMINOE/SHIRLEY MOUNTAINS, WYOMING
From 11-DEC-21 00:50:00 to 11-DEC-21 14:50:00 (MST-7)
Magnitude: 63.00 MG
Reported by: RAWS

RAWS mesonet station Camp Creek (CAMW4) measured maximum wind gust at 9:50 AM on the 11th west of Muddy Gap.

High Wind in SHIRLEY BASIN, WYOMING
From 11-DEC-21 16:22:00 to 12-DEC-21 16:28:00 (MST-7)
Magnitude: 56.00 MG
Reported by: Department of Highways

WYDOT mesonet station Shirley Rim (WY44) 2 miles northwest of Shirley Basin along WY487 measured maximum wind gust at 8:46 PM MST on the 11th.

High Wind in EAST PLATTE COUNTY, WYOMING
From 11-DEC-21 15:00:00 to 12-DEC-21 03:38:00 (MST-7)
Magnitude: 53.00 MG
Reported by: Department of Highways

WYDOT mesonet station Coleman (WY1) 13 miles south of Glendo along Interstate 25 measured maximum wind gust at 3:00 PM MST on the 11th. Phifer Airfield AWOS station (KEAN) in Wheatland also measured gust of 59 MPH. Interstate 25 between Glendo and Wheatland was closed for an extended period of time.

High Wind in LARAMIE VALLEY, WYOMING
From 11-DEC-21 03:00:00 to 11-DEC-21 22:38:00 (MST-7)
Magnitude: 70.00 MG
Reported by: Department of Highways

WYDOT mesonet station Quealy Dome (WY26) 14 miles northeast of Centennial along Interstate 80 measured maximum wind gust at 3:14 PM MST on the 11th. CWOP mesonet station FW4449 Laramie 9 miles east-northeast of Woods Landing and Union Pacific Railroad mesonet station RKRIVR (UP345) 1 miles south of Rock River also reported high winds.

High Wind in SNOWY RANGE, WYOMING
From 11-DEC-21 12:40:00 to 11-DEC-21 15:58:00 (MST-7)
Magnitude: 67.00 MG
Reported by: Mesonet

CWOP mesonet station FW6033 Centennial 2 miles west-northwest of Centennial measured maximum wind gust.

High Wind in SOUTH LARAMIE RANGE, WYOMING
From 10-DEC-21 23:29:00 to 12-DEC-21 13:56:00 (MST-7)
Magnitude: 74.00 MG
Reported by: Mesonet

Multiple WYDOT and Union Pacific Railroad mesonet stations reported high winds with gusts 60 to 70 MPH. UPR mesonet station SHERWS (UR535) 2 miles west-northwest of Buford measured maximum wind gust at 5:45 PM MST on the 11th. Interstate 80 between Cheyenne and Laramie was closed for an extended period of time.

High Wind in SOUTH LARAMIE RANGE FOOTHILLS, WYOMING
From 11-DEC-21 00:42:00 to 11-DEC-21 19:19:00 (MST-7)
Magnitude: 70.00 MG
Reported by: Mesonet

Multiple WYDOT and Union Pacific Railroad mesonet stations reported high winds with gusts 60 to 70 MPH. UPR mesonet station EMKAYW (UP226) 14 miles west-southwest of Cheyenne measured maximum wind gust at 1:12 AM MST on the 11th.

High Wind in CENTRAL LARAMIE COUNTY, WYOMING
From 11-DEC-21 02:48:00 to 11-DEC-21 21:53:00 (MST-7)
Magnitude: 57.00 MG
Reported by: Department of Highways

WYDOT mesonet station Bear Creek (WY40) 8 miles south of Chugwater along Interstate 25 measured maximum wind gust at 5:38 PM MST on the 11th. Cheyenne Airport ASOS station (KCYS) also measured wind gust of 63 MPH.

High Wind in CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY, WYOMING
From 11-DEC-21 11:00:00 to 12-DEC-21 16:54:00 (MST-7)
Magnitude: 76.00 MG
Reported by: Department of Highways

WYDOT mesonet station Bordeaux (KBRX) along Interstate 25 measured maximum wind gust 9 miles south of Wheatland at 6:46 PM MST on the 11th.

High Wind in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 11-DEC-21 17:00:00 to 12-DEC-21 10:16:00 (MST-7)
Magnitude: 65.00 MG
Reported by: Department of Highways

Multiple WYDOT mesonet station measured wind gusts 60 to 70 MPH. WYDOT mesonet station Cooper Cove (WY24) along Interstate 80 measured maximum wind gust 7 miles east-southeast of Arlington at 6:06 PM MST on the 11th.