10-11
GNFAC Avalanche Forecast for Sun Mar 20, 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:
New snow and wind for some touch conditions in the backcountry. Photo Tom Leonard
GNFAC Avalanche Advisory for Sat Mar 19, 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 avalanche was triggered 50 feet away from the crown. It occured on a NNE aspect and broke about 1.5 ft deep and 150 ft wide running about 100 ft vertical. Notice exposed rocks above the crown and above slopes in the background. Last week's storm dropped about 2 ft of snow (2 in of SWE). This slope received that snow plus all the snow that landed on the exposed rocks. Remotely triggered avalanches signal very touchy conditions. Photo: M. Young
Snowpit-crown profile from natural avalanche in the Northern Bridgers on 18 March 2011
Forecast link: GNFAC Avalanche Advisory for Sat Mar 19, 2011
This slide ran more than 1,300 vertical feet, banking off an adjacent slope and taking out trees in its path.
This crown was 3-5 feet deep and propagated 400 feet wide.