A strong feed of moisture from the Pacific Ocean combined with favorable upper-level dynamics and low-level upslope flow to produce heavy snow across portions of western and central Wyoming. The heaviest snow fell in Natrona County with Casper Mountain receiving the most snow with as much of 32 inches reported. The city of Casper had 10 to 16 inches with higher amounts in the southern sections of town. Thermopolis and Lander also had favorable upslope flow and averaged around 10 and 8 inches of new snow, respectively. Less snow fell in other areas, but gusty winds combined with the snow to produce near white-out conditions that closed major roads including Interstate 25 and US 20/26. Across the west, the most snow fell in the vicinity of Jackson Hole with reports of 6 to 12 inches fairly common, especially north of the town of Jackson.

Winter Storm in NATRONA COUNTY LOWER ELEVATIONS, WYOMING
From 14-DEC-15 16:00:00 to 15-DEC-15 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell throughout much of Natrona County with the heaviest amounts closer to Casper Mountain. Amounts where generally 10 to 16 inches across the city of Casper with 9.5 inches at the Casper Airport. Lesser amounts fell in northern portions of the county with 5 to 6 inches at Midwest.

Winter Storm in CASPER MOUNTAIN, WYOMING
From 14-DEC-15 14:00:00 to 15-DEC-15 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter measured 32 inches of new snow on Casper Mountain. SNOTEL stations estimated anywhere from 23 to 27 inches of snow.

Winter Storm in NORTHEAST JOHNSON COUNTY, WYOMING
From 14-DEC-15 17:00:00 to 15-DEC-15 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A combination of moderate to heavy snow and winds gusting to 40 mph led to the shutdown of Interstate 25 south of Buffalo for several hours.

Winter Storm in SOUTHEAST JOHNSON COUNTY, WYOMING
From 14-DEC-15 16:00:00 to 15-DEC-15 14:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A combination of moderate to heavy snow and winds gusting up to 45 mph led to near whiteout conditions that led to the closure of Interstate 25 for several hours.

Winter Storm in CODY FOOTHILLS, WYOMING
From 14-DEC-15 07:00:00 to 14-DEC-15 16:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

The public reported 8 inches of snow in Cody on Facebook.

Winter Storm in WIND RIVER BASIN, WYOMING
From 14-DEC-15 15:00:00 to 15-DEC-15 07:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

A combination of moderate to heavy snow and winds gusting over 40 mph closed highway 20 26 from Shoshoni to the Fremont / Natrona county line.

Winter Storm in LANDER FOOTHILLS, WYOMING
From 14-DEC-15 14:00:00 to 15-DEC-15 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

At the Lander airport 8.1 inches of snow was measured. Across the Lander foothills most areas had 6 to 9 inches of new snow.

Winter Storm in GREEN MOUNTAINS & RATTLESNAKE RANGE, WYOMING
From 14-DEC-15 15:00:00 to 15-DEC-15 14:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter measured 7 inches of snow at Sweetwater Station.

Winter Storm in SOUTHWEST BIG HORN BASIN, WYOMING
From 14-DEC-15 13:00:00 to 15-DEC-15 16:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters reported anywhere from 8 to 14 inches across Thermopolis.

Winter Storm in JACKSON HOLE, WYOMING
From 13-DEC-15 18:00:00 to 14-DEC-15 20:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters reported from 6 to 12 inches of new snow across the Jackson Valley.