This slide broke on a 40 degree slope. The debris was not deep enough to bury a person, but could have caused trauma due to the exposed rocks. Photo: GNFAC
14-15
This broke on facets formed during two weeks of cold weather. It broke 6-12 inches deep, about 100 feet wide and ran about 300 feet vertical. Photo: GNFAC
Forecast link: GNFAC Avalanche Advisory for Mon Nov 24, 2014
GNFAC Avalanche Forecast for Thu Nov 20, 2014
Snowpack and Avalanche Discussion
This skier triggered avalanche broke about 6 inches deep on a layer of obvious facets capped by a wind slab. It occurred on a South to Southeast facing slope. Photo: J. Hall
Forecast link: GNFAC Avalanche Forecast for Thu Nov 20, 2014
The debris from this slide ran into exposed rocks. Avalanches early season can cause serious tramua because the snowpack is so thin. Photo: J. Hall
Forecast link: GNFAC Avalanche Forecast for Thu Nov 20, 2014
This skier triggered avalanche broke about 6 inches deep on a layer of obvious facets capped by a wind slab. It occurred on a South to Southeast facing slope. Photo: J. Hall
Forecast link: GNFAC Avalanche Forecast for Thu Nov 20, 2014
GNFAC Avalanche Advisory for Mon Nov 17, 2014
Snowpack and Avalanche Discussion
The snowpack in the mountains is slowly building. Eight to 10 inches of snow is covering the ground from the Bridger Range to the Big Sky area with the mountains south of Big Sky to West Yellowstone having 16 inches. Cooke City, always one to lead the pack, is showing 2 feet on the ground.
These fast-moving point release avalanches, also called sluffs, were seen outside Cooke City this weekend. Photo: B. Fredlund
Forecast link: GNFAC Avalanche Advisory for Mon Nov 17, 2014
These crystals changed from snowflakes into angular crystals that are weak and poorly bonded. They are called depth hoar and they form in thin snowpacks when there are cold temperatures. Depth hoar creates conditions favorable for avalanches later in the winter. Photo: Mark Staples
Forecast link: GNFAC Avalanche Advisory for Mon Nov 17, 2014