Avalanche: Cornice Ridge 12/24/2009

Observer Name:

Jensen 12-26-08, weed 12-28-09

Observation Date:

12/26/2009

Occurrence Date:

12/24/2009

Occurrence Time:

Unknown

Region:

Cornice Ridge
Tony Grove
Logan River
Logan

Location

41° 53' 41.748" N, 111° 39' 57.8484" W

Avalanche Characteristics

Elevation:

9500'

Aspect:

Northeast

East

Slope Angle:

Alpha Angle:

Trigger:

Unknown

Trigger: additional info:

Unintentionally Triggered

Remotely Triggered

Sympathetic Release

Avalanche Type:

Hard Slab

Weak Layer:

Facets

Depth (avg):

Depth Range:

22" to

Width:

1/4 mile

Width Range:

1/4 mile to

1/2 mile

Vertical:

500'

Vertical Range:

350' to

600'

Snow Profile

Snow Profile Comments:

Christmas hard slab ranging from 2' to 6' deep and very broad, failed on thin layer of weak faceted snow just above a thin dusty crust from November.

General Comments

Video 1:

General Comments 2

It's a bit difficult to describe the size of this avalanche, classification of HS-AM?-d3-r5-O doesn't quite capture it. Again, hard to know for sure, but it looks like most of the cirque avalanched in one big event…..

Video 2:

General Comments 3

A person feels pretty small in this country.....This is looking southeast from Cornice Ridge at my partner Josh dropping into the bed surface on the southern part of the avalanche

General Comments 4

I'm glad nobody got caught in this monster... Debris piled deeply on trees and into an abrupt sink-hole below the slope...

Javascript is required to view this map.