Black Mtn, East Face, Rider Triggered Wind Slab

AVALANCHE OBSERVATION
Black Mountain, East Face

Drainage:

Submission Info
Forecaster
Sunday, January 21, 2018 - 2:45pm
Red Flags: 
Recent loading by new snow, wind, or rain
Obvious avalanche path
Avalanche Type: 
Slab
Slope: 
40degrees
Trigger type: 
Snowboarder
Aspect: 
East
Avalanche Width: 
100ft.
Terrain: 
Above Treeline
Elevation: 
10 800ft.
Bed Surface: 
Old Snow
Avalanche Length: 
150ft.
Number of partial burials: 
0
Number of full burials: 
0
More detailed information about the avalanche: 

Rider(Snowboarder based on tracks) triggered Wind Slab on east face of Black Mountain (R1, D1), elevation ~10800', East aspect , ~100' x ~150". Looked to be shallow, slope prone to wind loading with West to Northwest winds. Very small sloughs on test slopes where distrubed.Picture quality is poor due to flat light. Highlighted rough outline of the debris. Track exited out of the debris and continued down the route. 

Avalanche Photos: 
Blowing Snow: 
Yes
Cloud Cover: 
50% of the sky covered by clouds
Air temperature: 
Below Freezing
Wind Speed: 
Light
Precipitation: 
Snow
Air temperature trend: 
Cooling
Wind Direction: 
West
Accumulation rate: 
Less than 1 in. per hour
More detailed information about the weather: 

Scattered flurries. 

Number of People Caught: 
0
Black Mtn, East Face 38° 2' 34.08" N, 119° 16' 5.52" W

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