A slow-moving storm system moved out of Utah and across southern Wyoming producing a period of heavy snow on Christmas Day. Low-to-mid level wind flow was from the northeast and favored upslope conditions across Hot Springs, Fremont, and Natrona counties. Snow totals ranged from 7 to 13 inches in these areas. The northern portions of both the Jackson and Star valleys reported snowfall of around one foot. The highest amounts of one to two feet fell in the foothills of the Wind River Range near Lander and on Casper Mountain. The same cold front that produced the favorable upslope flow also brought gusty northeast winds to the basins east of the Continental Divide beginning early Christmas morning. Northeast wind of 20 to 30 mph was common. The strongest wind was in Sweetwater County where sustained speeds of 30 to 40 mph and gusts to 51 mph combined with the snow to produce treacherous driving conditions on Interstate 80.

Winter Storm in SOUTHWEST BIG HORN BASIN, WYOMING
From 25-DEC-14 04:00:00 to 25-DEC-14 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell throughout Hot Springs County. The heaviest amounts were near Thermopolis where totals were 12 to 16 inches.

Winter Storm in WIND RIVER MOUNTAINS EAST, WYOMING
From 25-DEC-14 03:00:00 to 26-DEC-14 11:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell in the eastern slopes of the Wind River Range. The highest amounts fell in Sinks Canyon State Park where snowfall of 14 to 20 inches was measured.

Winter Storm in NATRONA COUNTY LOWER ELEVATIONS, WYOMING
From 25-DEC-14 03:00:00 to 25-DEC-14 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Heavy snow fell in portions of Casper nearest Casper Mountain. Snowfall in this area ranged from 7 to 11 inches. Lesser amounts of 4 to 6 inches fell in other portions of the Casper area.

Winter Storm in CASPER MOUNTAIN, WYOMING
From 25-DEC-14 03:00:00 to 25-DEC-14 23:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall of 12 to 18 inches was measured on Casper Mountain.

Winter Storm in LANDER FOOTHILLS, WYOMING
From 25-DEC-14 05:00:00 to 26-DEC-14 04:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

In Lander, 7 to 10 inches of new snow fell across town.

Winter Storm in GREEN MOUNTAINS & RATTLESNAKE RANGE, WYOMING
From 25-DEC-14 04:00:00 to 26-DEC-14 02:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

The cooperative observer in Jeffrey City measured 6 inches of snow.

Winter Storm in ROCK SPRINGS & GREEN RIVER, WYOMING
From 25-DEC-14 05:00:00 to 26-DEC-14 00:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters measured 5 inches of snow in Green River and Rock Springs. The snow combined with northeast wind of 30 to 40 mph with gusts as high as 51 mph to make for treacherous travel on Interstate 80 across Sweetwater County.

Winter Storm in JACKSON HOLE, WYOMING
From 24-DEC-14 16:00:00 to 25-DEC-14 15:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell in the Jackson Valley. Some amounts included 12 inches in Moose and 9 inches in the city of Jackson.

Winter Storm in STAR VALLEY, WYOMING
From 24-DEC-14 16:00:00 to 26-DEC-14 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell across the northern Star Valley. Alpine had 12 inches of snow with 8 inches at Star Valley Ranch. Lesser amounts fell farther south where Afton only measured 2.5 inches of snow.

Winter Storm in UPPER GREEN RIVER BASIN FOOTHILLS, WYOMING
From 24-DEC-14 17:00:00 to 25-DEC-14 14:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell in portions of the Upper Green River Foothills. The heaviest amounts fell west of Daniel where 16 inches was measured. Around a foot of snow was measured around Bondurant. Lesser amounts were noted around Pinedale.