A powerful low pressure system tracked into the central Great Plains producing a tight pressure gradient and trowal winter precipitation that produced blizzard or near-blizzard conditions and high winds throughout portions of southeastern Wyoming. Peak wind gusts were measured into the lower 80 mph range with several drifts exceeding two feet across the region. Heavy snowfall across the Sierra Madre Range was also measured. Travelers across the area interstates came to a halt due to the hazardous conditions for them and the maintenance crews to safely clear.

Blizzard in GOSHEN COUNTY, WYOMING
From 29-NOV-19 21:00:00 to 30-NOV-19 16:00:00 (MST-7)
Reported by: Trained Spotter

Trained spotters across northern Goshen County near Jay Em and south-southwest of Lusk reported blizzard conditions with visibility less than 50 feet and heavy snow of over 6 inches.

Heavy Snow in CENTRAL CARBON COUNTY, WYOMING
From 29-NOV-19 19:00:00 to 30-NOV-19 19:00:00 (MST-7)
Reported by: SNOTEL

Sage Creek Basin site at an elevation of 7850 feet measured half inch of snow-water equivalent and the application of the a 12 to 1 ratio produced an estimated snowfall amount of 6.0 inches. Due to blowing snow and hazardous road conditions, Interstate 80 was closed to all traffic for several hours during this event.

Blizzard in NORTH SNOWY RANGE FOOTHILLS, WYOMING
From 29-NOV-19 22:22:00 to 30-NOV-19 23:48:00 (MST-7)
Reported by: Department of Highways

Several Wyoming Department of Transportation sensors along Interstate 80 measured and reported blizzard conditions. The interstate was closed for several hours due to the inability to quickly and efficiently remove drifting snow and the treacherous conditions that would endanger human life. Several sensors along the interstate measured high wind warning winds in the area with the strongest being at Strouss Hill at 73 mph.

Heavy Snow in SIERRA MADRE RANGE, WYOMING
From 29-NOV-19 19:00:00 to 30-NOV-19 19:00:00 (MST-7)
Reported by: SNOTEL

Battle Mountain sensor at an elevation of 7440 feet measured a snow water equivalent of 0.9 inches and applying a ratio of 14 to 1 gave an estimated 12.6 inches of snowfall as there was some initial rainfall measured as well.

High Wind in LARAMIE VALLEY, WYOMING
From 30-NOV-19 00:06:00 to 30-NOV-19 01:00:00 (MST-7)
Magnitude: 70.00 MG
Reported by: Department of Highways

Wyoming Department of Transportation sensor along Interstate 80 at Quealy Dome measured the reported wind gust.

High Wind in CENTRAL LARAMIE COUNTY, WYOMING
From 30-NOV-19 23:56:00 to 30-NOV-19 23:59:00 (MST-7)
Magnitude: 50.00 MG
Reported by: Department of Highways

Wyoming Department of Transportation sensor along Interstate 25 at Bear Creek measured the reported wind gusts. High winds continued at the site on December 1st.

Blizzard in SOUTH LARAMIE RANGE, WYOMING
From 29-NOV-19 23:16:00 to 30-NOV-19 16:04:00 (MST-7)
Reported by: Department of Highways

Several Wyoming Department of Transportation sensors along Interstate 80 reported and measured blizzard conditions along with high winds gusting up to 77 mph.  A nearby Union Pacific Railroad sensor measured a 81 mph wind gust. Due to the high winds, blowing snow, and blizzard conditions, all area roadways were closed to clear and keep travelers off the roads.

Blizzard in SOUTH LARAMIE RANGE FOOTHILLS, WYOMING
From 30-NOV-19 07:28:00 to 30-NOV-19 19:00:00 (MST-7)
Reported by: Department of Highways

Wyoming Department of Transportation sensor along Interstate 80 at Otto along with several other sensors along I-80 and the Wyo-Hill sensor along I-25 measured blizzard conditions. The Otto sensor particularly also measured a 71 mph gust with most blizzard conditions having high wind warning winds during that time frame. Interstate traffic was closed for several hours due to hazards conditions brought on by blizzard conditions and high winds.

Blizzard in CONVERSE COUNTY LOWER ELEVATIONS, WYOMING
From 30-NOV-19 07:55:00 to 30-NOV-19 12:45:00 (MST-7)
Reported by: ASOS

Blizzard conditions were measured at the Douglas, Converse County Airport. Heavy snowfall accumulations over 6 inches were measured by area observers along with Interstate travel being closed on I-25 for crews to clear and keep folks off the road for safety.

Blizzard in NIOBRARA COUNTY, WYOMING
From 30-NOV-19 06:02:00 to 30-NOV-19 15:52:00 (MST-7)
Reported by: Department of Highways

Wyoming Department of Transportation sensor along United States Highway 20 at Van Tassell measured blizzard conditions with peak wind gusts reaching up to 52 mph during the event. Snowfall accumulation measured up to a foot in Lusk. In addition, area highways and roads were closed to travelers due to the adverse conditions.

Heavy Snow in NORTH LARAMIE RANGE, WYOMING
From 29-NOV-19 22:00:00 to 30-NOV-19 23:00:00 (MST-7)
Reported by: Public

Observer located south of Glenrock or twenty-one miles east-northeast of Shirley Basin measured 15.5 inches of snowfall.

Heavy Snow in FERRIS/SEMINOE/SHIRLEY MOUNTAINS, WYOMING
From 29-NOV-19 23:00:00 to 30-NOV-19 23:00:00 (MST-7)
Reported by: Trained Spotter

Observer at Muddy Gap measured 30 inches of snowfall. While the amount may be elevated due to area winds and drifting, all roadways in the area were closed and impassable due to the snow and deep drifts.

Winter Storm in SHIRLEY BASIN, WYOMING
From 30-NOV-19 00:46:00 to 30-NOV-19 18:04:00 (MST-7)
Reported by: Department of Highways

Wyoming Department of Transportation sensor at Shirley Rim measured periods of near-blizzard like conditions. Longest duration of blizzard conditions was from 9:50 AM MST to 11:10 MST on the 30th. A spotter near Medicine Bow measured two feet of snow with considerable drifting along with a spotter measuring 5 inches and drifting at Shirley Basin. Area roadways were closed for several hours due to impassible roadways.

High Wind in EAST PLATTE COUNTY, WYOMING
From 30-NOV-19 12:42:00 to 30-NOV-19 13:30:00 (MST-7)
Magnitude: 50.00 MG
Reported by: Department of Highways

Wyoming Department of Transportation sensor along Interstate 25 at Coleman measured the reported wind gust.