Natural Avalanche - Mammoth Rock Bowl

AVALANCHE OBSERVATION
Mammoth Rock Bowl

Drainage:

Submission Info
Forecaster
Wednesday, December 23, 2015 - 8:00pm
Red Flags: 
Recent loading by new snow, wind, or rain
Avalanche Type: 
Slab
Slope: 
40degrees
Trigger type: 
Natural
Crown Height: 
5 ft
Aspect: 
North
Weak Layer: 
Storm Snow
Avalanche Width: 
300ft.
Terrain: 
Near Treeline
Elevation: 
9 700ft.
Bed Surface: 
Storm Snow
Avalanche Length: 
900ft.
Number of partial burials: 
0
More detailed information about the avalanche: 

Naturaly trigger avalanche during the storm / heavy winds likely during the night of Dec 23rd.  Hard wind slab, 2.5-6' crown that wrapped around most of bowl.  Released just below ridge top at convexity.  Broke several small trees in run-out zone.  Hard slab, pencil hardness, ran on pencil hardness layer with no obvious weak layer in between.  Did NOT run to ground.       

Avalanche Photos: 
Blowing Snow: 
No
Cloud Cover: 
25% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Calm
Precipitation: 
None
Air temperature trend: 
Static
Wind Direction: 
Accumulation rate: 
None
More detailed information about the weather: 

Cold day, -10 deg celsius air temp.  Calm winds :-).  Scattered clouds.  

Number of People Caught: 
0
37° 36' 39.4812" N, 118° 59' 39.912" W

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