A slow moving area of low pressure moved out of Great Basin and passed very slowly across the southern portion of Wyoming and brought heavy snow to much of the southern two thirds of the state. The heaviest snow in the mountains fell over the East Slopes of the Wind River Mountains where favorable upslope flow brought over 2 feet of new snow to many areas with a maximum of 34 inches at the Townsend Creek SNOTEL. In the lower elevations, the heaviest snow fell across Sweetwater County. In Rock Springs and Green River, over a foot of snow was common with as much as 23 inches in some locations. The Lander Foothills and Wind River Basin where also hard hit with 12 to 18 inches of snow common. In addition, strong mid level winds mixed to the surface in some areas and brought blizzard conditions to portions of central and southern Wyoming. Portions of Interstate 80 as well as Highway 28 over South Pass were closed at times during the height of the storm.

Winter Storm in LANDER FOOTHILLS, WYOMING
From 23-FEB-17 00:00:00 to 24-FEB-17 07:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

At the Lander airport, 16 inches of snow fell. Snowfall amounts around the Lander foothills generally ranged from 9 to 18 inches.

Winter Storm in WIND RIVER BASIN, WYOMING
From 23-FEB-17 00:00:00 to 24-FEB-17 06:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy snow fell through portions of the Wind River Basin. At the Riverton airport, 13 inches of snow was measured with 9 to 12 inches through the city of Riverton. Further north, downsloping flow off of the Owl Creek Mountains kept accumulations lower. At Boyson Dam, there was 6 inches of snow.

Winter Storm in FLAMING GORGE, WYOMING
From 22-FEB-17 20:00:00 to 24-FEB-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A CocoRaHS observer measured 10 inches of snow at the Buckboard Marina.

Blizzard in EAST SWEETWATER COUNTY, WYOMING
From 23-FEB-17 09:30:00 to 23-FEB-17 12:30:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Rock Springs airport had visibility drop to around a quarter of a mile and frequent wind gusts past 35 mph on February 23rd. These conditions led to nearly impossible travel conditions and closure of Interstate 80 for several hours.

Winter Storm in EAST SWEETWATER COUNTY, WYOMING
From 22-FEB-17 20:00:00 to 24-FEB-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter measured 8 inches of snow in Wamsutter. Southeast of Rock Springs, 11 inches of snow was measured.

Winter Storm in NORTHEAST JOHNSON COUNTY, WYOMING
From 23-FEB-17 09:00:00 to 24-FEB-17 10:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A CocoRaHS observer measured 7 inches of snow 4 miles southwest of Buffalo.

Winter Storm in CASPER MOUNTAIN, WYOMING
From 22-FEB-17 22:00:00 to 24-FEB-17 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

The SNOTEL on Casper Mountain reported 17 inches of new snow.

Winter Storm in NATRONA COUNTY LOWER ELEVATIONS, WYOMING
From 22-FEB-17 23:00:00 to 24-FEB-17 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Heavy snow fell across portions of Natrona County. The heaviest snow fell in the western portions of Natrona County where Powder River picked up 13 inches of new snow. Amounts around the city of Casper generally ranged from 4 to 8 inches with 9.4 at the Natrona County airport. Much less snow fell in northern Natrona County where only 1 inch of snow fell at Midwest.

Blizzard in GREEN MOUNTAINS & RATTLESNAKE RANGE, WYOMING
From 23-FEB-17 08:00:00 to 23-FEB-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

The weather sensor at Beaver Rim along Highway 28 reported visibility below a quarter of a mile and frequent wind gusts over 35 mph for several hours on the morning of February 23rd.

Blizzard in WIND RIVER MOUNTAINS WEST, WYOMING
From 23-FEB-17 04:00:00 to 23-FEB-17 14:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A long period of blizzard conditions occurred over South Pass with frequent wind gusts past 40 mph and heavy snow combined to bring white out conditions over Wyoming 28. The road was closed through this period.

Blizzard in WIND RIVER MOUNTAINS EAST, WYOMING
From 23-FEB-17 04:00:00 to 23-FEB-17 14:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A long period of blizzard conditions occurred over South Pass with frequent wind gusts past 40 mph and heavy snow combined to bring white out conditions over Wyoming 28. The road was closed through this period.

Winter Storm in GREEN MOUNTAINS & RATTLESNAKE RANGE, WYOMING
From 22-FEB-17 23:00:00 to 24-FEB-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell across the Green and Rattlesnake Range. The highest snow amount measured was 17 inches at Jeffrey City.

Winter Storm in UPPER GREEN RIVER BASIN, WYOMING
From 22-FEB-17 23:00:00 to 24-FEB-17 09:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters measured 6 to 9 inches around Farson. Snowfall amounts decreased further north in the zone.

Winter Storm in WIND RIVER MOUNTAINS WEST, WYOMING
From 22-FEB-17 20:00:00 to 24-FEB-17 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

Very heavy snow fell across the East Slopes of the Wind River Range with amounts over two feet commonplace. Some of the highest amounts reported for SNOTELs included 34 inches at Townsend Creek and 28 inches at Deer Park. A COOP observer reported 26 inches of new snow at Atlantic City.

Winter Storm in ROCK SPRINGS & GREEN RIVER, WYOMING
From 22-FEB-17 20:00:00 to 24-FEB-17 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Very heavy snow fell through Rock Springs and Green River. Amounts over a foot were common. The highest amount recorded was 23 inches in Rock Springs. Interstate 80 was shut down for a time due to the snow and drifting snow from gusty winds.