This slide was likely triggered by a smaller slide off the ridge. The crown was 3-5 feet deep and propagated 400 feet across. It failed on a layer of facets near the ground.
10-11
GNFAC Avalanche Advisory for Fri Mar 18, 2011
Snowpack and Avalanche Discussion
The Bridger, Madison and Gallatin Ranges, the Lionhead area near West Yellowstone, the mountains around Cooke City and the Washburn Range:
More snow = more avalanches. With SWE (snow water equivalent) totals ranging from 1.6 - 3.3 inches from this week’s storm, the snowpack was pushed to its breaking point in a few places, and several large avalanches were observed.
GNFAC Avalanche Advisory for Thu Mar 17, 2011
Snowpack and Avalanche Discussion
The Bridger, the northern Madison and northern Gallatin Ranges, the Lionhead area near West Yellowstone, the mountains around Cooke City and the Washburn Range:
Snow water equivalent (SWE) is the amount of water you would get if the snow melted. At remote SNOTEL sites, it is the most accurate measurement of precipitation. SWE in the past 48 hours:
1.3 inches - Shower Falls in Hyalite
This natural avalanche was 1 of 2 observed in the Republic Creek drainage just south of Cooke City. It occured on an E aspect and appeared to have broken into older layers of snow. The total snow water equivalent for this area during the recent storm was 3.1 inches (roughly 3 feet of snow). Photo: B. Fredlund
Forecast link: GNFAC Avalanche Advisory for Fri Mar 18, 2011
GNFAC Avalanche Forecast for Wed Mar 16, 2011
Snowpack and Avalanche Discussion
The Bridger, the northern Madison and northern Gallatin Ranges:
GNFAC Avalanche Forecast for Tue Mar 15, 2011
Snowpack and Avalanche Discussion
The Bridger, the northern Madison and northern Gallatin Ranges:
The Fin on Republic Peak outside Cooke City avalanched big Monday night during the storm. A cornice may have triggered it. This is the second time this slope avalanched this season. Photo: Beau Fredlund