An arctic boundary slowly sagged southward across much of northern and central Wyoming and brought bitterly cold temperatures. Temperatures in northern Wyoming fell as low as minus 30. In addition, a couple of moisture laden troughs moved across the area and brought another round of heavy snow to western Wyoming. Some parts of Yellowstone Park had as much as 30 inches of snow. Other locations in Teton, Lincoln and Sublette County also received over a foot of new snow.

Winter Storm in ABSAROKA MOUNTAINS, WYOMING
From 11-FEB-21 12:00:00 to 14-FEB-21 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

At Pahaska, Wyoming, 28 inches of new snow fell.

Winter Storm in TETON & GROS VENTRE MOUNTAINS, WYOMING
From 11-FEB-21 15:00:00 to 14-FEB-21 08:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell in the Tetons. Some of the more notable amounts included 28 inches at Jackson Hole and 17 inches at Grand Targhee, Wyoming.

Winter Storm in SALT RIVER & WYOMING RANGES, WYOMING
From 11-FEB-21 15:00:00 to 13-FEB-21 21:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: SNOTEL

New snowfall amounts in the Salt and Wyoming Range generally ranged from one to two feet.

Winter Storm in UPPER WIND RIVER BASIN, WYOMING
From 11-FEB-21 15:15:00 to 13-FEB-21 22:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter measured 12 inches at Dubois, Wyoming. Amounts dropped sharply further south and east.

Extreme Cold/Wind Chill in SOUTHEAST JOHNSON COUNTY, WYOMING
From 12-FEB-21 00:00:00 to 14-FEB-21 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Extreme cold hit southern Johnson County, Wyoming. Some of the more notable low temperatures included 23 below zero at Linch, Wyoming and 20 below north of Kaycee, Wyoming.

Avalanche in SOUTHWEST BIG HORN BASIN, WYOMING
From 11-FEB-21 18:00:00 to 12-FEB-21 15:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Very cold temperatures hit portions of Natrona County, Wyoming. The Hot Springs County Airport dropped to 21 below zero.

Extreme Cold/Wind Chill in NORTH BIG HORN BASIN, WYOMING
From 12-FEB-21 00:00:00 to 14-FEB-21 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Extreme cold occurred in Big Horn County, Wyoming, especially in northern portions of the County. Cowley, Wyoming had temperatures drop as low as minus 26 and Lovell, Wyoming had a low temperature of minus 23 on the morning of the 13th.

Extreme Cold/Wind Chill in NORTHEAST JOHNSON COUNTY, WYOMING
From 12-FEB-21 00:00:00 to 14-FEB-21 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Extreme cold occurred in northern Johnson County, Wyoming. Some of the more notable low temperatures included minus 25 at the Buffalo, Wyoming airport and minus 27 along Interstate 25.

Extreme Cold/Wind Chill in CODY FOOTHILLS, WYOMING
From 12-FEB-21 00:00:00 to 14-FEB-21 16:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Extreme cold hit the Cody Foothills. Some of the more notable low temperatures included minus 22 at the Yellowstone Regional airport and minus 23 at Clark, Wyoming.

Extreme Cold/Wind Chill in NATRONA COUNTY LOWER ELEVATIONS, WYOMING
From 13-FEB-21 18:00:00 to 14-FEB-21 16:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Extremely cold temperatures hit portions of Natrona County, Wyoming. Some of the more notable lows included minus 27 at Natrona, Wyoming and minus 24 at the Casper, Wyoming Airport.

Winter Storm in YELLOWSTONE NATIONAL PARK, WYOMING
From 11-FEB-21 12:00:00 to 14-FEB-21 12:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell in portions of Yellowstone Park. Over an foot of snow fell in many locations.

Winter Storm in STAR VALLEY, WYOMING
From 11-FEB-21 15:00:00 to 13-FEB-21 21:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy snow fell in the Star Valley. Snowfall amounts generally ranged from 10 to 15 inches.

Winter Storm in JACKSON HOLE, WYOMING
From 11-FEB-21 15:00:00 to 13-FEB-21 21:00:00 (MST-7)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snowfall amounts across the Jackson Valley generally ranged from 6 to 12 inches.