Large avalanches continue to run to the valley bottoms and cross popular trails. We show this problem as being below treeline not because you can trigger an avalanche, but because you can be hit by one from above. Watch out for overhead hazard!
Wind loading was occurring through the day on Wednesday, and we expect fresh windslabs to be forming at higher elevations. Some speculate that today's wind loading was the trigger for a very large avalanche near Bow Hut.
Deep persistent slabs are best managed by:
Cornices are best managed by:
Southwest flow continues with flurries expected on Wednesday night, possible accumulations of 3-5 cm by Thursday. The temperatures will fall slightly on Thursday, but expect freezing levels to reach about 1500 meters and treeline temperature from -5 to -8. Winds will remain moderate from the southwest.
100cm of dense, rounded snow comprises the upper half of the snowpack and sits on a very weak base of depth hoar. This unstable structure produces consistent, sudden collapse test results in the depth hoar layer approximately 60cm from ground. Two shears persist near the surface down 15 and 35cm indicating lingering instability in the storm snow.
Report of big avalanche activity on the Bow Hut approach today. Fresh size 2 avalanche over the trail, and a very large (estimated size 3.5) deep slab from the Vulture Glacier ran over the Bow Hut headwall and covered the trail through the moraines. These are our only reports from today, but they indicate that large avalanches remain very likely.