Large Deep Slab Avalanches in Desolation Wilderness

Large destructive deep slab avalanches in Desolation Wilderness seen from Mt. Tallac on Mar. 27-up to at least 11 counted.  All of these avalanches are thought to have occurred during the March 20-22 rain/ high elevation snow event.  All of the avalanches seem to have wet snow characteristics with avalanches at lower elevations (below 8000') sliding down near the ground.  All of these avalanche were thought to have failed on the Feb. 22 near surface facets that were buried.  At lower elevations throughout the forecast region, this facet layer was buried near or on the ground.  During the March 20-22 atmospheric river event remote sensors showed up to 6-8'' of rain up to 8000-9000'.  Depending on location and elevation, snow levels dropped after the rain event and added up to several additional feet of snow.