Observation Date
Saturday, February 26, 2022
Avalanche Date
Saturday, February 26, 2022
Region
Logan » Logan River » Tony Grove » Cornice Ridge » Grandfather Cornice » Grandfather Cornice, Nose
Location Name or Route
Grandfather Cornice Area, The Nose
Elevation
9,000'
Aspect
East
Slope Angle
40°
Trigger
Snowmobiler
Trigger: additional info
Unintentionally Triggered
Avalanche Type
Soft Slab
Avalanche Problem
Wind Drifted Snow
Weak Layer
New Snow/Old Snow Interface
Depth
8"
Width
60'
Vertical
200'
Comments
The slab looked to have been triggered by snowmobile climbing a wind loaded convex area a few hundred feet beneath the ridgeline.
I didn't take a very close look at the failed layer as there was hangfire and other unstable looking sections surrounding the area.
It looked to be around 8-10" at the deepest spots and ran 60-80 feet or so. Debris pile 4-5' at the deepest collection.
Comments
We observed numerous small slab avalanches in the area. Most of which we had ski-cut (powsurf-cut) or intentionally triggered with cornice. These were in low consequence areas and didn't run far but were 6-7" deep.
Coordinates