Avalanche on Stevens peak

Location Name: 
Stevens. Lower north cirque
Region: 
Carson Pass Area
Date and time of avalanche (best estimate if unknown): 
Wed, 02/12/2014 - 11:30
Location Map: 
United States
38° 44' 23.4888" N, 119° 59' 1.9608" W
See map: Google Maps
US


Red Flags: 
Recent avalanche activity
Recent loading by new snow, wind, or rain
Rapid warming
Terrain Trap
Observation made by: Public
Avalanche Observations
Avalanche Type: 
Slab
Slope: 
45degrees
Crown Height: 
3 ft
Aspect: 
East
Weak Layer: 
Unknown
Avalanche Width: 
100ft.
Terrain: 
Above Treeline
Elevation: 
9 500ft.
Bed Surface: 
Unknown
Avalanche Length: 
400ft.
More detailed information about the avalanche: 

I was walking thru the flats on the supportable crust on the east facing terrain below the east facing cliffs when I saw a powder cloud up above.  The avalanche released around the rocks just below ridge line. Possibly new windslab on crust. Then went over a lower cliff, and stepped down into a larger release with a crown of approx. 3 feet.  The larger chunks stopped as they entered the trees, with a deposition of approx. 4' , ( 2nd photo ) with the softer snow running a few hundred feet further. The toe of the avalanche debris was up to three feet deep

I also observed remnents of  2 large slides from Saturday/Sunday. One on Stevens ran thru the thick willows on the long flat bench, and over into the lower drainage. Looked to be pretty much full path. (1st photo). Also, on red lake pk a slide on north face of crater lake cirque left a deposition 10+ feet deep at bottom

Avalanche Photos: 
Weather Observations
Blowing Snow: 
Yes
Air temperature: 
Above Freezing
Wind Speed: 
Strong
Wind Direction: 
Southwest