Tetons

At the higher elevations strong south-southwest winds have formed pockets of surface slab up to 18 inches deep on leeward aspects. These soft slab lie upon hard old snow surfaces and could be triggered by humans who venture into steep avalanche starting zones and cliff areas. The wet isothermal snowpack at the lower elevations is unstable. Wet slides are possible on steep snow covered slopes. The snowpack is expected to be mostly stable at the mid elevations.

A large Pacific trough with a strong south-southwest flow aloft will drift east into the region. Locally heavy snow showers above an elevation of 8,000 feet and mainly rain below that elevation are likely overnight and into the day on Sunday. Thunderstorms are a possibility. By Sunday evening some of the highest areas could receive up to ten inches of new snow while some valleys locations could receive up to a half inch of rain. Colder air will begin to move in and drop the snowline to the valley floor by Monday morning. Temperatures will be in the 20s and 30s in the mountains and in the 30s in the valleys. Winds will be southerly at 15 to 25 miles per hour. The general avalanche hazard is expected to be MODERATE. Wet slides are possible on steep snow covered slopes below an elevation of 7,500 feet. The potential for wet slides to occur could rapidly increase in areas that receive heavy rainfall. At the higher elevation new soft slabs up to a foot deep could form on leeward aspects and may be sensitive to human triggers in very steep avalanche starting zones and cliff areas. In areas where weak faceted snow persist in the snowpack some potential may exist for humans to triggerd slab avalanches up to three feet in depth.