Western Wyoming PM Forecast

Issued on Sat April 04, 2020 6:55 PM

Situation

Western Wyoming was under partly cloudy to mostly sunny skies on Saturday. Mountain temperatures rose into the upper 20s as the valleys climbed to near 40. Southwesterly to westerly ridgetop winds ranged from 10 to 20 miles per hour at most weather stations. Mount Coffin, in the Southwest Trails area, had hourly averages between 20 and 30 miles per hour.

As the day warmed, sunlit slopes became damp to wet, and small wet loose slides emanated from cliff bands and rock outcroppings. This week’s snowfall remained dry on mostly shaded aspects, and today’s winds were strong enough for some transportation of available snow onto leeward slopes. A small skier triggered slide was observed today on an east facing aspect of East Angle Mountain on Togwotee Pass. This event may have occurred today. Fresh avalanche activity was also observed on Little Tuckermans on Teton Pass.

Forecast For Sunday, April 05, 2020

Expect cloud cover to increase this evening followed by the development of light snow showers. Light, scattered snow showers will be possible through the afternoon on Sunday. In the afternoon, precipitation will transition to rain in the valleys. A few breaks in cloud cover will also be possible. Overnight temperatures in the mountains will be near 20 before rising into the mid-30s during the day. Southerly to southwesterly ridgetop winds will range from 10 to 20 miles per hour.

The general avalanche hazard is expected to be Moderate above 9,000 feet on Sunday. Up there, skiers and riders could trigger wind slabs one to two feet deep in steep, avalanche prone terrain. These slabs could be come more susceptible to failure in the afternoon as temperatures climb above freezing, especially if extended periods of sunshine occur. Any extended periods of sunshine could also result in small wet loose slides on steep, sunlit slopes. If snow surfaces start to become wet, transition to shaded terrain. In both of this week’s fatalities, the victims were wearing transceivers, but tragically neither of their beacons were turned on. This a stark reminder to do full beacon checks before leaving the trailhead. For every person, verify their batteries are good, and their transceivers are both sending and receiving properly.

Trend For Monday, April 06, 2020 AND Tuesday, April 07, 2020

Another round of light snowfall is in store for Sunday night and Monday. Similar avalanche conditions will continue.
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