Forecast link: GNFAC Avalanche Advisory for Sun Feb 19, 2012
Forecast link: GNFAC Avalanche Advisory for Sun Feb 19, 2012
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Forecast link: GNFAC Avalanche Advisory for Sun Feb 19, 2012
Forecast link: GNFAC Avalanche Forecast for Sat Feb 18, 2012
GNFAC Avalanche Advisory for Fri Feb 17, 2012
Snowpack and Avalanche Discussion
The Bridger, Madison, and Gallatin Ranges, the Lionhead area near West Yellowstone, and the mountains around Cooke City:
New snow fell on 5 of the last 7 days. This snow by itself has not been enough to change the avalanche danger much since it has slowly accumulated, and riding conditions have improved. More importantly, however, this snowfall provided ammunition for increased winds to build many fresh wind slabs.
Heavy wind loading was observed on Saddle Peak in the Bridger Range today. The skiers who took this photo "experienced" many small slab avalanches. Photo: D. Hebert
This avalanche was triggered when a skier walked onto this slope. His tracks are just out of view to the right of the photo. Photo: Ben VandenBos
Forecast link: GNFAC Avalanche Advisory for Fri Feb 17, 2012
Increased winds formed wind slabs that produced avalanches in Hyalite Canyon. Most were about this size and occurring just under ridgetops. Many occurred on S-aspects. Photo: B. VandenBos
GNFAC Avalanche Forecast for Thu Feb 16, 2012
Snowpack and Avalanche Discussion
The mountains around Cooke City:
During dry, clear weather last week, the snow surface formed a new weak layer which is now buried about 1 foot deep. Recent natural avalanche activity occurred on this layer (photo1, photo2). Slopes receiving wind-blown snow will be the best places to trigger avalanches on this layer. Fortunately this instability is easy to assess since it is not buried deeply.