Observer Name
Toby Weed
Observation Date
Saturday, December 18, 2021
Avalanche Date
Saturday, December 18, 2021
Region
Logan » Logan River » Tony Grove » Tony Grove-Blind Hollow Saddle
Location Name or Route
Eastern Rock Bowl or TG-Blind Hollow Saddle Area
Elevation
8,800'
Aspect
North
Slope Angle
40°
Trigger
Unknown
Trigger: additional info
Remotely Triggered
Avalanche Type
Hard Slab
Avalanche Problem
Persistent Weak Layer
Weak Layer
Facets
Depth
3'
Width
125'
Vertical
250'
Comments
Reported via text message. Actually reporting two avalanches in the same general area, both on steep rocky slopes and failed on PWL. Small one appeared to be skier triggered 2' x 20', the larger perhaps remotely triggered from a nearby uptrack.
I went up to the site on 12/19. Sure enough, the avalanche had failed on a buried persistent weak layer of sugary faceted snow above the Nov.12 rain/rime-crust.
Comments
A skin-track went along the ridge above the avalanche and then to the west and towards pt. 9248. I could see that the slope just below the uptrack and to the west had collapsed and cracked extensively but had not avalanched because of a lower slope angle. Cracks were visible across the slope, hundreds of feet away from the avalanche.
Video
Coordinates