Western Wyoming PM Forecast

Issued on Thu April 18, 2019 6:56 PM

Situation

Skies were mostly sunny over Western Wyoming on Thursday as a ridge of high pressure moved into the region. Mountain temperatures rose into the mid to upper 30s as the valleys climbed into the mid-50s. Westerly to northwesterly ridgetop winds ranged from 15 to 25 miles per hour.

Abundant sunshine and warm temperatures resulted in significant avalanche activity as the April snowfall was substantially heated for the first time. Both large to very large wet slabs and wet loose slides released naturally. These avalanches traveled long distances and ran into low angle terrain. Additional information and pictures can be found on the Avalanche Events page.

Forecast For Friday, April 19, 2019

Skies will be mostly clear overnight and through the day on Friday. Overnight lows in the mountains will be in the mid-20s before climbing into the mid-40s in the afternoon. The valleys will drop to near freezing tonight before rising to near 60 during the day. Westerly ridgetop winds will back to the southwest at 10 to 20 miles per hour.

Expect mostly stable conditions in the early morning hours after below freezing temperatures and clear skies form crusts overnight. The general avalanche hazard will quickly rise to Considerable above 7,500 feet as the crusts break down and snow surfaces become saturated. Once this happens, naturally releasing wet loose slides and large to very large wet slabs will become likely. Get a very early start, be prepared for a rapid increase in the wet snow avalanche hazard, and get off of and out from under avalanche prone terrain before conditions become unstable. While the snowpack below 7,500 feet has undergone numerous melt freeze cycles, wet slides will still be possible where the snowpack still exists.

Trend For Saturday, April 20, 2019 AND Sunday, April 21, 2019

Rain up to 9,500 feet on Saturday could keep the threat of wet slides alive before colder temperatures and cloud cover return on Sunday. Our last evening regional avalanche forecast of the 2018/19 season will be issued on Saturday, April 20th, and the final morning avalanche hazard bulletins of the season will be issued on Sunday, April 21st.
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