Avalanche: Logan 12/19/2010

Observer Name: 
David Tidhar
Observation Date: 
12/19/2010
Occurrence Date: 
12/19/2010
Occurrence Time: 
Unknown
Region: 
Logan
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Avalanche Characteristics
Elevation: 
Unknown
and steeper
Slope Angle: 
30
Trigger: 
Natural
Avalanche Type: 
Soft Slab
Weak Layer: 
New Snow/Old Snow Interface
Depth (avg): 
8"
Depth Range: 
6" to
12"
Width: 
Unknown
Vertical: 
Unknown
General Comments

skiing 8500-~7500' Bear River Mtns -  cautious skiing and route finding in difficult trail breaking conditions.  

rain below ~7000" dense snow falling above. light ridge winds

we witnessed evidence of natural slide activity on slopes of >30 degrees. slides appeared generally shallow (<6") though one crown face appeared from above to perhaps be 1' deep;  having run perhaps 100 meters. we triggered a small 4-6" deep slide comprised of wind slab after dropping a small cornice piece along a wind exposed ridge.  lateral propagation was small and the slide ran only a short distance due to concave slope.    

impressive north facing cornice build up with impressive elasticity

snow density was heavy with a few pockets of moderate density snow in the trees on NW aspect.  Very heavy rain below 7000 with snow extremely saturated at elevations around 5000-6300'

perhaps some hoar and light density snow layer sitting atop the rain crust from last weekend.

High today; Moderate to High tomorrow depending on weather and temperature today. 


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