21-22
The snow was breaking 1 foot off the ground in the layer at the blue crystal card. Weak, sugary snow broke and propagated in the extended column test with 18 and 21 taps. We anticipate this weakness to get worse in the coming weeks. Photo: GNFAC
There was almost 2 feet of snow (60 cm) at 8800' on NE aspect of Sawtelle Peak. Weak snow (facets) is forming a foot off the ground and were breaking consistently in stability tests. Photo: GNFAC
Snowcover on Lionhead ridge begins at about 7,000' in elevation on 11/16. Snowmobiling or skiing from Targhee Pass looks very thin and patchy. Photo: GNFAC
Forecast link: GNFAC Avalanche Forecast for Fri Nov 19, 2021
Taken on 11/16, consistent snow on all aspects begins around 7,000 feet. 1.5-2 feet of snow is found above 8.500'. Photo: GNFAC
Natural avalanches (on persistent weak layer) near Cooke
Henderson Mountain
Cooke City
Code
SS-N-R2-D2-O
Elevation
10000
Aspect Range
NE, N
Latitude
45.05240
Longitude
-109.94500
Notes
From email 11/15/21: "east Henderson had a fresh slab avalanche- on a NE aspect around 10,000'. It appeared to have failed on a we weak layer ear the ground, and I'd guess it was about 2-3' deep and 300'+ wide. (photo attached)
Also noted some other natural slab avalanches on some northerly aspects of Miller Ridge. (steep rocky starting zones). And noted a couple big sl slab valanches on NE erly aspects up Republic Creek too. Similar thing there: steep, rocky, wind loaded starting zones."
Number caught
0
Number buried
0
Avalanche Type
Soft slab avalanche
Trigger
Natural trigger
R size
2
D size
2
Bed Surface
O - Old snow
Problem Type
Persistent Weak Layer
Slab Thickness
24.0 inches
Slab Width
100.00ft
Slab Thickness units
inches
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year