GNFAC Avalanche Advisory for Sat Dec 28, 2013
Snowpack and Avalanche Discussion
Bridger Range Gallatin Range Madison Range
Lionhead area near West Yellowstone
13-14
This slide was triggered by a cornice drop. Photo Ben Vandenbos
This slope collapsed and cracked when a small chunk of cornice was dropped on it. The problem is very weak facets about a foot above the ground. The only reason this did not produce an avalanche is the slope is 24 degrees in steepness. A few degrees more and it would have avalanched. Photo: J. Yarington
This small slide occurred very close to the trailhead for Beehive Basin just north of Big Sky. Even though small, it is a bad sign when small slopes avalanche that normally don't. Photo: GNFAC
This slide occurred just left of a common skin track in Beehive Basin just north of Big Sky. The skin track ascends the area along the right side of the photo. Photo: GNFAC
Forecast link: GNFAC Avalanche Advisory for Sat Dec 28, 2013
This slide probably occurred on 12-26 and may have been triggered by pinwheels of snow rolling down from the rocks above. A common skin track goes up the subridge in the foreground. Photo: GNFAC
This human triggered slide occurred just north of Lulu Pass outside of Cooke City. A heavy wind load sitting on a layer of facets with a trigger was the recipe that caused this slide. Photo GNFAC