Western Wyoming PM Forecast

Issued on Sat March 23, 2019 6:46 PM

Situation

Skies were cloudy today and light snow showers fell in isolated mountain locations with negligible accumulations. Periods of brief sunshine occurred, particularly in the Southwest Trails area. Temperatures in the mountains generally rose from the low twenties this morning to the upper thirties this afternoon while valleys reached into the mid-forties. Summit winds were light with averages near ten mph from the northwest.

Warming temperatures and partial sunlight softened the snow surface in all but steep shaded terrain above 8000 feet. This weakening of the snow surface was most significant at the lower elevations. A wet slide occurred late this morning near Astoria Hot Springs in the Snake River Canyon. Debris from the slide almost crossed both lanes and hampered traffic. Similar to some events on Teton Pass this year, the snow slid on mesh, placed there to prevent rock slides. A smaller low elevation slide also occurred just north of town this afternoon that did not impact the highway.

Forecast For Sunday, March 24, 2019

Another weak system is to impact southwestern Wyoming Sunday and increase northward through the rest of the morning. Snowfall with light accumulations is expected at the higher elevations where high temperatures are to reach the low thirties and winds are to be light. At low elevations, minimal precipitation is expected to fall primarily as flurries that could also fall as light rain at times where temperatures could reach the upper thirties.

The general avalanche in the Tetons will be LOW at all elevations in the morning and will increase to MODERATE at the low elevations where warming and potential rain will allow for the possibility of wet slides similar to today’s events. In the Southwest Trails and Togwotee Pass areas, the danger will be MODERATE all day as the unlikely but possible potential for deep slab avalanches continues in higher terrain and wet slide activity will again become possible at lower terrain in the afternoon.

Trend For Monday, March 25, 2019 AND Tuesday, March 26, 2019

Monday and Tuesday look to be mostly to partly clear. Overnight temperatures are expected to drop below freezing at all elevations but daytime highs will continue to provide for the chance for wet slides at increasingly higher elevations.
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