Likelihood ?CertainVery LikelyLikelyPossible
Size ?HistoricVery LargeLarge
Over 15" of high density snow along with strong and gusty south to southwest winds has further increased the size of wind slabs that formed yesterday. Winds slabs 2 to 4+ feet thick now exist near tree line and above tree line on NW-N-NE-E aspects in the Mammoth and June Mountain areas. Large destructive avalanches are possible.
Widespread slab and loose dry snow avalanches are occurring at the June Mtn ski area. This afternoon, precipitation and snowfall rates exceeded 0.3" and 4 inches of snowfall in one hour on Mammoth Mountain. High snowfall and loading rates will continue for several more hours, followed by snow showers for the rest of the evening.