Small intentional skier-triggered avalanche on Trimmer

Location Name: 
Trimmer
Region: 
Luther Pass Area (including Job and Freel)
Date and time of avalanche (best estimate if unknown): 
Tue, 03/22/2011 - 17:00
Location Map: 
United States
38° 52' 42.9816" N, 119° 55' 40.962" W
See map: Google Maps
US


Red Flags: 
Whumphing noises, shooting cracks, or collapsing
Recent loading by new snow, wind, or rain
Observation made by: Public
Avalanche Observations
Avalanche Type: 
dry,slab,
Slope: 
42degrees
Trigger type: 
Skier
Crown Height: 
2 ft
Aspect: 
Northwest
Weak Layer: 
Storm Snow
Avalanche Width: 
30ft.
Terrain: 
Near Treeline
Elevation: 
9 100ft.
Bed Surface: 
Storm Snow
Avalanche Length: 
25ft.
Number of similar avalanches: 
1
More detailed information about the avalanche: 

On ascent, informal tests such as hand pits and ski cuts over skin track suggested stability.  Small shooting cracks were observed on convex rolls along ridgelines. 

Pic 1: Taken from trigger point, looking downward toward debris.

Pic 2: Crown tapered from 50 cm at largest point to 15 cm at flank. 

Avalanche Photos: 
Weather Observations
Blowing Snow: 
No
Air temperature: 
Below Freezing
Wind Speed: 
Light
Precipitation: 
None
Air temperature trend: 
Cooling
Wind Direction: 
Southwest
Accumulation rate: 
None
More detailed information about the weather: 

Very light snowfall earlier in afternoon from SCT skies.