A strong cold front dropped slowly southward across Wyoming. The front combined with ample moisture, favorable jet dynamics and lee cyclogenesis over Colorado to bring heavy snow many areas East of the Continental Divide. The heaviest snow fell in the favored northeasterly upslope areas of Fremont and Natrona Counites. Near Lander, Wyoming, some locations reported 20 inches of snow with 10 to 16 inches around the city of Lander, Wyoming. Amounts around Riverton, Wyoming, ranged from 9 to 13 inches, with anywhere from 8 to 17 inches around Casper, Wyoming. The snow combined with winds gusting to around 50 mph at times, making travel nearly impossible for a time and bringing numerous road closures, including much of Interstates 25 and 80 for two days.

Winter Storm in NORTHEAST JOHNSON COUNTY, WYOMING
From 02-FEB-20 15:00:00 to 04-FEB-20 01:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell in northern Johnson County. Snowfall amounts generally ranged from 6 to 9 inches with locally higher amounts. The snow combined with winds gusting over 40 mph brought blowing and drifting snow that resulted in the closure of Interstates 25 and 90 for a time.

Winter Storm in YELLOWSTONE NATIONAL PARK, WYOMING
From 02-FEB-20 20:00:00 to 04-FEB-20 04:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A combination of snow and strong wind resulted in the closure of US 287.

Winter Storm in ROCK SPRINGS & GREEN RIVER, WYOMING
From 03-FEB-20 03:00:00 to 04-FEB-20 00:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Although snowfall amounts were only around 3 to 6 inches, a combination of snow and strong wind resulted in near zero visibility that resulted in the closure of Interstate 80 for a time.

Winter Storm in EAST SWEETWATER COUNTY, WYOMING
From 03-FEB-20 03:00:00 to 03-FEB-20 21:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Although snowfall amounts were only around 3 to 6 inches, a combination of snow and strong wind resulted in near zero visibility that resulted in the closure of Interstate 80 for a time.

Winter Storm in SOUTHEAST JOHNSON COUNTY, WYOMING
From 02-FEB-20 17:00:00 to 04-FEB-20 01:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell in portions of southern Johnson County, with the maximum amount reported 9 inches to the southeast of Kaycee, Wyoming. The snow combined with strong wind that resulted in the closure of Interstate 25 for a time.

Winter Storm in SOUTHWEST BIG HORN BASIN, WYOMING
From 02-FEB-20 20:00:00 to 04-FEB-20 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell in Hot Springs County. Snow amounts around Thermopolis, Wyoming, ranged from 6 to 10 inches.

Winter Storm in WIND RIVER MOUNTAINS EAST, WYOMING
From 02-FEB-20 20:00:00 to 04-FEB-20 03:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell in portions of the Wind River Mountains. The highest amount reported was 17 inches at Atlantic City, Wyoming.

Winter Storm in SOUTHEAST BIG HORN BASIN, WYOMING
From 02-FEB-20 20:00:00 to 04-FEB-20 06:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell in portions of Washakie County, with the highest amounts near Ten Sleep, Wyoming, where up to 8 inches of snow was measured.

Winter Storm in NATRONA COUNTY LOWER ELEVATIONS, WYOMING
From 02-FEB-20 21:00:00 to 04-FEB-20 03:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell throughout much of Natrona County. Areas around Casper, Wyoming had the most with some of the more notable amounts included 17 inches 10 miles west of Casper, Wyoming and 15.7 inches at the Casper, Wyoming, airport.

Winter Storm in WIND RIVER BASIN, WYOMING
From 02-FEB-20 21:00:00 to 04-FEB-20 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snowfall amounts around the area generally ranged from 6 to 13 inches. Some notable amounts included 12.7 inches in downtown Riverton, Wyoming, and 9.7 inches at the Riverton, Wyoming, airport.

Winter Storm in YELLOWSTONE NATIONAL PARK, WYOMING
From 02-FEB-20 21:00:00 to 04-FEB-20 03:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy snow fell throughout Lander, Wyoming, with around 10 to 16 inches around the town and up 20 inches in the surrounding foothills. At the Lander, Wyoming, airport, 13.7 inches of new snow was measured.

Winter Storm in STAR VALLEY, WYOMING
From 02-FEB-20 21:00:00 to 04-FEB-20 01:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell in portions of the Star Valley. The highest amount recorded was 12.5 inches at Afton, Wyoming.

Winter Storm in CASPER MOUNTAIN, WYOMING
From 02-FEB-20 19:00:00 to 04-FEB-20 05:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

The SNOTEL at Casper Mountain in Natrona County, Wyoming, reported 14 inches of new snow.