Bishop Bowl crown profile

AVALANCHE OBSERVATION
Bishop Bowl/Above Aspendell

Drainage:

Submission Info
Friday, January 18, 2019 - 1:00pm
Red Flags: 
Recent avalanche activity
Recent loading by new snow, wind, or rain
Obvious avalanche path
Terrain Trap
Avalanche Type: 
Dry
Slab
Slope: 
33degrees
Trigger type: 
Natural
Crown Height: 
2 ft
Aspect: 
East
Weak Layer: 
Old Snow
Avalanche Width: 
250ft.
Terrain: 
Near Treeline
Elevation: 
9 939ft.
Bed Surface: 
Old Snow
Avalanche Length: 
600ft.
More detailed information about the avalanche: 

This avalanche apparently was naturally triggered on Friday 1/18/2019 between 1300 and 1630, the day after the recent storm cycle cleared out.  A photo of it was posted on Friday, and since this was a fairly large natural avalanche, R3-D2.5, in a popular area, it merited a closer look.  Today (1/20) we toured up to the release zone to see what the bed surface was and what layers failed.  In the attached profile, the layer between 47-57 cm above the ground appeared to be the layer that failed - the upper portion of the basal facet layer.  The storm layer has gained strength over the past few days.

Snowpit or crown profile photo or graph: 
Bishop Bowl crown profile
Bishop Bowl avy viewed from Aspendell
Bishop Bowl crown profile pit location
Crack in snow surface
Blowing Snow: 
Yes
Cloud Cover: 
100% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Moderate
Precipitation: 
None
Air temperature trend: 
Cooling
Wind Direction: 
Southwest
More detailed information about the weather: 

Storm building.

Bishop Bowl 37° 14' 27.348" N, 118° 36' 49.572" W

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