Avalanche: Claytons 1/5/2012

Observer Name: 
Evelyn/Rick
Observation Date: 
01/05/2012
Occurrence Date: 
01/05/2012
Occurrence Time: 
1:30pm
Region: 
Claytons
Big Cottonwood Canyon
Salt Lake
Location Name: 
Claytons, Big Cottonwood Canyon
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Location

40° 35' 32.766" N, 111° 33' 37.6344" W
Avalanche Characteristics
Elevation: 
10500'
Aspect: 
Northeast
Trigger: 
Skier
Trigger: additional info: 
Intentionally Triggered
Cornice Triggered
Avalanche Type: 
Soft Slab
Weak Layer: 
Facets
Depth (avg): 
unknown
Depth Range: 
8" to
14"
Width: 
20'
Vertical: 
350'
General Comments

Getting boring out there, so tested stability with some cornice drops.  First, we had good visibility, and could see no one was below, or anywhere in site for that matter.  Rather empty backcountry these days. Video is one of two avalanches we triggered by cutting off cornices with a knotted cord.  Both slides seemed to run slowly, gouging and entraining snow as they went.  Seemed like they might have broken out more snow going over the second break over.  Debris looked deep.  Second slide was slightly wider, up to 30' wide.

Confirmed for me that steep, northeasterly facing slopes can still be triggered by a person hitting the wrong spot - and it would probably be slightly off the ridge line so it could break out above you, on a steeper break over, not every slope, and not necessarily obviously wind loaded.

Video 1: 
General Comments 2

Looking at the second crown - weak layer...(drum roll)...facets!  Slides were soft slabs, except where they pulled back into the hard wind drift along the ridge line. 

claytons.jpg
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