Air temperatures dropped into the mid to lower 20s in most locations overnight. At the upper elevations snow surfaces could remain frozen for most of the day. At the mid and lower elevations areas of thin crust with isothermal snow beneath those crusts exist. Some potential may develop for wet slides to be human triggered on very steep slopes after these crusts soften.
Humans may be able to trigger wet slides on very steep slopes with unconsolidated isothermal snow during the warmest portion of the day.
A rapidly moving Pacific system will bring clouds Saturday evening then rapidly accumulating snow beginning early Sunday morning passing by Sunday afternoon leaving up to 10 inches of accumulation in the Tetons with less snow expected in the Togwotee Pass and Southwest Trails areas. Winds will pick up from the west with averages up to 35 miles per hour. Mountain temperatures will rise from the mid teens in the morning to the low 20s.The General Avalanche Hazard is expected to be MODERATE. Cold overnight temperatures will freeze snow surfaces and put a cap on the warm snowpack, reducing the chance of deeper wet loose slides. The rapidly loading new snow with strong winds will develop new soft slabs to 18 inches in depth at upper elevations. The new snow will also help hold the warmth in the snowpack so that future warming periods will rapidly make the deeper snowpack unstable again. Depending on the morning temperatures the snowpack at lower elevations may continue to be unstable.
