Skier triggered avalanche in Bloody Couloir

AVALANCHE OBSERVATION
Bloody Couloir

Drainage:

Submission Info
Friday, February 23, 2018 - 2:15pm
Red Flags: 
Recent loading by new snow, wind, or rain
Obvious avalanche path
Terrain Trap
Avalanche Type: 
Slab
Slope: 
40degrees
Trigger type: 
Skier
Crown Height: 
Less than 1 ft
Aspect: 
North
Weak Layer: 
Storm Snow
Avalanche Width: 
45ft.
Terrain: 
Above Treeline
Elevation: 
12 000ft.
Bed Surface: 
Old Snow
Avalanche Length: 
1 700ft.
More detailed information about the avalanche: 

About 300 feet down from the top of the couloir the 2nd skier of a group of 4 on a ski cut released a R2.5, D2 slide that went wall to wall in the main shoot of the couloir and ran for most of the path stopping midway in the runout zone.  Crown height varied from 4" to 16" inches and averaged around 8" and debris in the toe was an estimated 3-4 feet deep.   Failed on the new/old snow interface.   Hard 1-2" windslab was the bed surface and we kicked off a few very small hardslab pockets when skiing the bed surface post main slide.  Good anchor points and skiing 1 at a time led to no injuries and fortunately no one being caught in the slide.

Avalanche Photos: 
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: 
North
More detailed information about the weather: 

Poor visablilty that cleared about 20 minutes post slide, cold north upslope light to moderate wind.

Number of People Caught: 
0
Bloody Mountain 37° 33' 3.996" N, 118° 55' 1.3656" W

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