Large depth hoar crystals are typically cupped and striated. These angular grains have a very difficult time bonding together, which creates a weak foundation for the winter snowpack. This photo was taken in Telemark Meadows in the southern Madison Range. Photo K. Birkeland
15-16
Weak faceted snow near the ground, also known as depth hoar, is abundant throughout the advisory area. This persistent weak layer can create dangerous avalnache conditions weeks even months after it forms. This photo was taken at Telemark Meadows in the southern Madison Range. Photo: K Birkeland
Forecast link: GNFAC Avalanche Advisory for Sat Dec 12, 2015
GNFAC Avalanche Forecast for Fri Dec 11, 2015
Snowpack and Avalanche Discussion
Cooke City
Alex Marienthal at Lionhead finds a thin snowpack that is weak and unstable. The top foot of snow is easily sliding in our stability tests. More snow will make the avalanche danger rise. Photo: GNFAC
Forecast link: GNFAC Avalanche Forecast for Fri Dec 11, 2015
GNFAC Avalanche Advisory for Thu Dec 10, 2015
Snowpack and Avalanche Discussion
Cooke City
GNFAC Avalanche Advisory for Thu Dec 10, 2015
Snowpack and Avalanche Discussion
This avalanche was triggered by a snowmobile on a NE facing slope. This small slide is an indication of weak faceted snow near the ground, which may produce more avalanches with additional load. Photo: S. Strenge
GNFAC Avalanche Forecast for Wed Dec 9, 2015
Snowpack and Avalanche Discussion
Southern Madison Range Southern Gallatin Range
Lionhead area near West Yellowstone Cooke City
GNFAC Avalanche Forecast for Tue Dec 8, 2015
Snowpack and Avalanche Discussion
Southern Madison Range Southern Gallatin Range
Lionhead area near West Yellowstone Cooke City
GNFAC Avalanche Forecast for Tue Dec 8, 2015
Snowpack and Avalanche Discussion