Historic winter storm crippled much of southeast Wyoming with heavy wet snow followed by strong winds and blizzard conditions. Cheyenne received 22.7 inches of snowfall in 24 hours (storm total 30.8 inches) with 4 to 6 foot drifts developing all over. Highest snowfall amount reported over 70 inches (4.5 inches snow water equivalent) in the North Laramie Range. Most areas were digging out from the storm for at least the following week as snow plows got stuck on roadways. Received numerous reports of roof collapses due to the heavy, wet snow. Areas of southeast Wyoming also experienced thundersnow with the heavier snow bands early Sunday morning.

Blizzard in CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY, WYOMING
From 14-MAR-21 05:00:00 to 14-MAR-21 22:00:00 (MST-7)
Reported by: Trained Spotter

Former NWS employee reported blizzard conditions most of the day Sunday with visibility below one eighth mile and strong wind gusts around 40 MPH 8 miles southwest of Wheatland. Reported average snow depth around 3 feet.

Blizzard in EAST PLATTE COUNTY, WYOMING
From 14-MAR-21 09:08:00 to 14-MAR-21 12:44:00 (MST-7)
Reported by: Department of Highways

Wyoming Department of Transportation mesonet station WY1 Coleman along Interstate 25 reported wind gusts 35 to 55 MPH with one quarter mile visibility. Area webcams showed whiteout conditions. Interstate 25 Wheatland to Douglas was closed starting 8:15 PM MST March 13th until 8:45 AM MDT March 17th.

Blizzard in CENTRAL LARAMIE COUNTY, WYOMING
From 14-MAR-21 04:42:00 to 14-MAR-21 14:10:00 (MST-7)
Reported by: ASOS

Cheyenne Airport ASOS station KCYS reported 35 to 55 MPH wind gusts and one quarter mile visibility. NWS Employees at the WFO also observed blizzard conditions. Reports of 3 to 5 foot high drifts reported across town and neighboring areas which shutdown the city of Cheyenne through the following Wednesday. Numerous power outages were reported around town. Roof collapse reported at CrossFit Frontier building due to heavy, wet snow. One fatality in Cheyenne was reported as a homeless person was found in the snow outside a church due to exposure from the cold and snow. Cheyenne area received 25 to 35 inches of snowfall. Officially storm total at NWS Cheyenne office was 30.8 inches.

Blizzard in EAST LARAMIE COUNTY, WYOMING
From 14-MAR-21 06:35:00 to 14-MAR-21 11:15:00 (MST-7)
Reported by: AWOS

Pine Bluffs Municipal Airport AWOS station K82V reported 35 MPH wind gusts and one quarter mile visibility. Area webcams showed whiteout conditions. Interstate 80 from Cheyenne to the Nebraska state border was closed from 3:40 AM MDT March 14th until 9:20 AM MDT March 17th. Pine Bluffs area reported around 20 inches of storm total snowfall.

Blizzard in GOSHEN COUNTY, WYOMING
From 14-MAR-21 07:55:00 to 14-MAR-21 13:53:00 (MST-7)
Reported by: ASOS

Torrington Municipal Airport ASOS station KTOR reported 35 to 45 MPH wind gusts and one quarter mile visibility. 20 to 30 inches of storm total snowfall in the area. Numerous power outages reported.

Blizzard in NIOBRARA COUNTY, WYOMING
From 14-MAR-21 03:26:00 to 14-MAR-21 12:32:00 (MST-7)
Reported by: Department of Highways

Wyoming Department of Transportation mesonet station WY60 Van Tassell along US20 reported wind gusts 40 to 60 MPH with one quarter mile visibility. Area webcams showed whiteout conditions.

Winter Storm in NORTH LARAMIE RANGE, WYOMING
From 13-MAR-21 03:00:00 to 15-MAR-21 05:00:00 (MST-7)
Reported by: SNOTEL

Windy Peak SNOTEL site estimated 72.5 inches of snowfall with 4.5 inches of snow water equivalent over this period.

Winter Storm in SIERRA MADRE RANGE, WYOMING
From 13-MAR-21 03:00:00 to 15-MAR-21 05:00:00 (MST-7)
Reported by: SNOTEL

Numerous SNOTEL sites reported 1 to 2 feet of snowfall including Blackhall Mountain SNOTEL site with estimated 26 inches snowfall with 1.5 inches of snow water equivalent.

Winter Storm in SNOWY RANGE, WYOMING
From 13-MAR-21 03:00:00 to 15-MAR-21 05:00:00 (MST-7)
Reported by: SNOTEL

Numerous SNOTEL sites reported 2 to 3 feet of snowfall including the Sand Lake SNOTEL with 36 inches snowfall on 1.8 inches of snow water equivalent.

Winter Storm in SHIRLEY BASIN, WYOMING
From 13-MAR-21 03:00:00 to 14-MAR-21 19:00:00 (MST-7)
Reported by: Trained Spotter

Reported two day storm total snowfall of 12 inches 5 miles east-northeast of Shirley Basin. Estimated 40 to 50 MPH winds both Saturday and Sunday.

Winter Storm in FERRIS/SEMINOE/SHIRLEY MOUNTAINS, WYOMING
From 13-MAR-21 03:00:00 to 14-MAR-21 19:00:00 (MST-7)
Reported by: Public

Received report from Muddy Gap gas station of 5 foot drifts and road closures in the area for US 287 and WYO 220 for at least 2 days. Estimated 2 feet of snowfall.

Winter Weather in UPPER NORTH PLATTE RIVER BASIN, WYOMING
From 13-MAR-21 03:00:00 to 14-MAR-21 19:00:00 (MST-7)
Reported by: CoCoRaHS

Snowfall reports across the area of 4 to 5 inches including site WY-CR-32 with 5.2 inches six miles northeast of Riverside.

Winter Storm in CONVERSE COUNTY LOWER ELEVATIONS, WYOMING
From 13-MAR-21 13:00:00 to 15-MAR-21 00:10:00 (MST-7)
Reported by: CoCoRaHS

Numerous CoCoRaHS observers reported 2 day storm total accumulations of 14 to 24 inches of snowfall near Douglas and Glenrock, including 23 inches 1 mile west-northwest of Glenrock and 21 inches 4 miles west-southwest of Douglas. Near blizzard conditions were reported with the Douglas Airport ASOS station recording 35 to 45 MPH wind gusts and visibility one half to three quarters mile visibility for much of the morning on the 14th.

Blizzard in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 14-MAR-21 01:26:00 to 14-MAR-21 10:38:00 (MST-7)
Reported by: Department of Highways

Interstate 80 between Laramie and Rawlins was closed from 7 PM MST March 13th through 9:15 AM MDT March 17th. 6 foot drifts were reported across the roadway with numerous sensors reporting 35 MPH wind gusts and visibility as low as one quarter mile at times, including WYDOT mesonet site WY19 Elk Mountain along Interstate 80.

Blizzard in CENTRAL CARBON COUNTY, WYOMING
From 14-MAR-21 06:53:00 to 14-MAR-21 09:53:00 (MST-7)
Reported by: ASOS

Rawlins Municipal Airport ASOS station KRWL reported 35 to 40 MPH wind gusts and quarter mile visibility for 3 hours. Area webcams showed whiteout conditions. 8 to 12 inches of snowfall reported around Rawlins.

Blizzard in LARAMIE VALLEY, WYOMING
From 14-MAR-21 07:00:00 to 14-MAR-21 10:35:00 (MST-7)
Reported by: ASOS

Laramie Regional Airport ASOS station KLAR reported 35 to 55 MPH wind gusts and quarter mile visibility for over 3 hours and near blizzard conditions for an extended period Sunday. Area webcams showed whiteout conditions. Around 2 feet of snowfall reported around Laramie.

Blizzard in SOUTH LARAMIE RANGE, WYOMING
From 14-MAR-21 04:38:00 to 14-MAR-21 15:38:00 (MST-7)
Reported by: Department of Highways

Wyoming Department of Transportation mesonet station WY36 Lone Tree along Interstate 80 reported wind gusts over 45 MPH and one quarter mile visibility. Area webcams showed whiteout conditions. WYDOT reported 5 foot drifts on Interstate 80 near the Summit which would require rotary plows to remove snow. Interstate 80 was closed in this area between Cheyenne and Laramie from 7:15 PM MST March 13th until 9:00 AM MDT March 17th. Area received around 30 to 35 inches of snowfall.

Blizzard in SOUTH LARAMIE RANGE FOOTHILLS, WYOMING
From 14-MAR-21 04:36:00 to 14-MAR-21 15:30:00 (MST-7)
Reported by: Department of Highways

Wyoming Department of Transportation mesonet station KWYH Wyo Hill along Interstate 25 reported wind gusts 40 to 55 MPH with one quarter mile visibility. Area webcams showed whiteout conditions. Interstate 25 was closed from the CO state line through Cheyenne starting 8 PM MST March 13th until 9:45 AM MDT March 16th. Between Cheyenne and Chugwater, Interstate 25 was closed until 11:00 AM MDT March 17th. Area received around 30 to 35 inches of snowfall.