Avalanche: Twin Lakes Pass 2/13/2010

Observer Name: 
Dan Griffith
Observation Date: 
02/13/2010
Occurrence Date: 
02/13/2010
Occurrence Time: 
2:30pm
Region: 
Salt Lake
Big Cottonwood Canyon
Twin Lakes Pass
Location Name: 
Highway to Heaven
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Avalanche Characteristics
Elevation: 
10400'
Aspect: 
South
Southwest
Slope Angle: 
33
Trigger: 
Skier
Trigger: additional info: 
Unintentionally Triggered
Sympathetic Release
Avalanche Type: 
Soft Slab
Weak Layer: 
New Snow/Old Snow Interface
Depth (avg): 
8"
Width: 
50'
Vertical: 
200'
People Involved
Caught: 
1
General Comments

This was an unintentional slide, but I knew that there was a soft slab up against the rock outcropping that I was traversing under to get

General Comments 2

As the day progressed today, slopes of 30-32 degrees were showing signs of significant instability.  I was able to ski cut small test slopes throughout the day, producing some shooting cracks of 6-12' wide.  Since these did not sustain enough pitch, they were not producing slabs to move down slope.  What was interesting today, is that stuff was not necessarily cracking right on the convexities, they were pulling out either just above them or a few feet below them.  Also, sloughs were running far and lots of natural activity was observed on just about all aspects that had any amount of wind loading.  Today was not aspect dependent, as there had been some serious cross loading that drifted slopes well below the ridge lines from the initial SW winds, then reburied by winds out of the NW.  Tricky out there today and you really needed to pay attention.


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