(RADAR) Snow coming to SE Wyo this afternoon, 'unseasonably frigid' air mass to follow - Cheyenne, WY Cap City News
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(RADAR) Snow coming to SE Wyo this afternoon, ‘unseasonably frigid’ air mass to follow

US 26/287 Wind River Lake, near Teton/Fremont County Line at 10:15 am 10/24/ 2020 (WYDOT)

CASPER, Wyo — Snow began in the northern parts of Wyoming around 6:00 am Saturday morning, the National Weather Service (NWS) said, and as is expected to impact the central regions around 1:00 pm. It will reach the southeast region by late afternoon.

A “very unseasonably frigid” air mass will follow the snow, bringing subzero temperatures and even colder wind chills across most of the state, impacting travel and presenting dangers to hunters and those recreating outdoors.

Winter weather advisories are in effect across most of the state, with winter storm warning affecting the higher elevations. In the southeast region, advisories take effect at 6:00 pm Saturday and are in effect until 6:00 am Monday

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NWS Cheyenne

“Dangerous travel conditions due to icy, snow covered roads and low visibilities in falling and blowing snow,” NWS said. Outdoorsman are advised that trails could difficult discern under accumulating snow, and “dangerously cold wind chills as low as 25 degrees below zero could cause frostbite on exposed skin in as little as ten minutes.”

 NWS Cheyenne said further wind chills as low as 30 to 40 degrees below zero are possible by Monday.

3-5 inches of total snowfall accumulation could occur in Casper through Saturday night, with 4-7 inches possible in Cheyenne.

Travel impacts for the weekend (WYDOT)

NWS is forecasting a general 5 to 8 inches of snow for the lower elevations with up to a foot expected over the Snowy, Sierra Madre Ranges, and Laramie ranges.

This simulated radar loop from NWS shows the projected time of impact of snowfall across the state.

There are also closures on Interstate 80 to light and high-profile vehicles due to high winds in effect through 6:00 pm Saturday. The closure affects the Arlington and Elk Mountain areas along I-80 between Laramie and Rawlins in addition to the Vedauwoo area along I-80 between Cheyenne and Laramie.For the latest road closure information, see WYDOT‘s website.

Record breaking low temperatures are expected beginning Saturday night through Tuesday morning.

Total forecast snow accumulations and wind gusts for other areas are as follows:

  • Teton and Gros Ventre Mountains: 8 to 14 inches with locally higher amounts possible and winds gusting 25 to 35 mph at the mountain peaks.
  • Absaroka and Beartooth mountains: 10 to 18 inches. Winds gusting as high as 35 mph.
  • Sheridan foothills: 4 to 8 inches. Winds gusting as high as 40 mph.
  • Snowies and Sierra Madres: 8-12 inches