These still exist in steep Alpine terrain, on lee aspects away from the wind, where warm heavy snow on Saturday fell on colder snow below. These are largest along the borders of Montana and BC (blame them!), as snowfall was heaviest in the West.
A crust down 1m (to Treeline, and higher on solar aspects) and Facets in the bottom 1/3rd of the snowpack, are slowly adjusting to recent heavy loading. Human triggering of large, destructive avalanches remains Possible, in the wrong terrain.
Deep persistent slabs are best managed by:
Cornices are best managed by:
Wednesday: Cloudy, Light precipitation ending in the morning. Rain/snow line at Treeline, lowering. Ridge Winds: SW, becoming Strong. Freezing level: 1950m. Treeline High 0.
Thursday: Sun & cloud. Ridge winds: Moderate SW. Freezing Level: 1000m, rising to 1500m. Treeline High -5
Friday: Cloudy, flurries later. Moderate SW winds. Freezing Level 1900.
A thick crust Below Treeline overlies a Moist snowpack. The crust thins out at lower treeline elevations, with a dry, late winter snowpack in the Alpine. New snow instabilities from Saturdays's storm are settling. A crust from Mid Feb, down 1m, is giving some sudden results in tests. The bottom of the snowpack is faceted, and still weak in places.
No new avalanches observed on Tuesday.
On Saturday, a warm storm caused a widespread cycle of Large (Size 2-3) Natural avalanches, mainly in the West where precipitation was heaviest. Many Wet Slabs initiated around 1900-2200m, some on the February 16 MFcr. Several Storm slabs & Deep Persistent slabs failed in steep, lee Alpine terrain.