Avalanche: Lower Cornice Ridge Area 3/17/2011

Observer Name:

Jeremy Jensen

Observation Date:

03/17/2011

Occurrence Date:

03/17/2011

Occurrence Time:

12:00pm

Region:

Logan
Logan River
Tony Grove
Lower Cornice Ridge Area

Location Name:

Tony Grove South of cornice ridge

Location

41° 53' 35.0772" N, 111° 39' 50.742" W

Avalanche Characteristics

Elevation:

9300'

Aspect:

East

Slope Angle:

Trigger:

Snowmobiler

Trigger: additional info:

Unintentionally Triggered

Avalanche Type:

Soft Slab

Weak Layer:

New Snow/Old Snow Interface

Depth (avg):

18"

Width:

200'

Vertical:

Unknown

General Comments

May have been two different slabs breaking, one on the ascent of the slope and one and the decent/landing. It looked to me like a snowmobiler had triggered the first slide on the way up the slope, turned around atop the cornice and jumped back into the slope triggering the slide to the north. Looked to be 12-18 inches deep and 150- 200 feet wide.

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