10-11
A thin layer of facets 2 feet below the surface propagated in our stability tests. This layer was found on both east and west facing slopes around 8,800 ft. A large snowstorm or wind load could make this layer reactive.
Forecast link: GNFAC Avalanche Forecast for Sun Mar 13, 2011
GNFAC Avalanche Advisory for Sat Mar 12, 2011
Snowpack and Avalanche Discussion
The Bridger Range, the Madison and Gallatin Ranges, and the Lionhead area near West Yellowstone, the mountains around Cooke City and the Washburn Range:
GNFAC Avalanche Forecast for Fri Mar 11, 2011
Snowpack and Avalanche Discussion
The Madison and Gallatin Ranges, and the Lionhead area near West Yellowstone, the mountains around Cooke City and the Washburn Range:
GNFAC Avalanche Forecast for Thu Mar 10, 2011
Snowpack and Avalanche Discussion
The Bridger, Madison and Gallatin Ranges, and the Lionhead area near West Yellowstone, the mountains around Cooke City and the Washburn Range:
Very large cornices exist throughout the advisory area. These cornices are a hazard by themselves but also make great triggers for avalanches like this one. Photo: S. Reznicek
GNFAC Avalanche Advisory for Wed Mar 9, 2011
Snowpack and Avalanche Discussion
The Bridger, Madison and Gallatin Ranges, and the Lionhead area near West Yellowstone, the mountains around Cooke City and the Washburn Range:
Soft slab avalanches were releasing in the circled area and running several hundred feet downslope. These should become larger if winds continue overnight. There are a few clouds in this picture, but much of what you see is wind blown snow. Photo: GNFAC