15-16
GNFAC Avalanche Advisory for Wed Feb 24, 2016
Snowpack and Avalanche Discussion
Southern Madison Range Southern Gallatin Range
Lionhead area near West Yellowstone Cooke City
GNFAC Avalanche Advisory for Tue Feb 23, 2016
Snowpack and Avalanche Discussion
Southern Madison Range Southern Gallatin Range Lionhead area near West Yellowstone Cooke City
This avalanche likely was triggered on Sunday morning (2/21). Buried surface hoar is propagating fractures with the new snow an wind-loading. Photo: A. Bertolino
These avalanches occured on Saturday morning (2/20) outside Cooke City above Goose Lake. The likely weak layer was surface hoar with new snow and wind-loading creating unstable conditions. Photo: A. Bertolino
The hard slab debris was from a wind-loaded slope. Luckily no one was caught. Photo: GNFAC
Forecast link: GNFAC Avalanche Advisory for Thu Feb 25, 2016
This avalanche was triggered on Saturday (2/20). It is 3-6 feet deep on a north facing slope at 10,200' on Scotch Bonnet outside Cooke City. No one was caught. The debris was hard wind slabs and the weak layer was surface hoar, seen as a stripe in the snowpit wall. Photo: GNFAC
On Friday (2/19) a snowmobiler was sidehilling across a north-facing slope when it avalanched on a buried surface hoar layer. This slide occured south of West Yellowstone on the Island Park side of Black Bear. Photo: B. Chouinard
GNFAC Avalanche Advisory for Mon Feb 22, 2016
Snowpack and Avalanche Discussion
Southern Madison Range Southern Gallatin Range
Lionhead area near West Yellowstone Cooke City
This slide was triggered by a snowmobiler in the Lionhead area near West Yellowstone. It likely failed on buried surface hoar. Fortunately nobody was caught. Photo T. Spencer
Forecast link: GNFAC Avalanche Advisory for Mon Feb 22, 2016