GNFAC Avalanche Forecast for Sat Feb 19, 2011
Snowpack and Avalanche Discussion
The Madison and Gallatin Ranges, the Lionhead area near West Yellowstone, the mountains around Cooke City and the Washburn Range:
10-11
GNFAC Avalanche Forecast for Fri Feb 18, 2011
Snowpack and Avalanche Discussion
The Bridger, Madison and Gallatin Ranges, the Lionhead area near West Yellowstone, the mountains around Cooke City and the Washburn Range:
This snowpit shows a faceted layer just under an ice crust about 2ft deep. It is not a major concern as it does not have enough stress from recent snow to produce widespread avalanches. However, its ability to propagate fractures (ECTP) is a red flag that tells us human triggered avalanches are definitely possible. Check the videos from Feb 17th and Feb 6th.
Plumes of snow were easily observed in the Bridger Range from Bozeman on Thursday afternoon Feb 17. This wind loading is a red flag that the weather is contributing to instability. Wind slabs near ridgetops will likely produce human tirggered avalanches. Photo: GNFAC
GNFAC Avalanche Advisory for Thu Feb 17, 2011
Snowpack and Avalanche Discussion
The Bridger, Madison and Gallatin Ranges, the Lionhead area near West Yellowstone, the mountains around Cooke City and the Washburn Range:
GNFAC Avalanche Forecast for Wed Feb 16, 2011
Snowpack and Avalanche Discussion
The Bridger Range: