Avalanche near Grouse Rocks

Location Name: 
Grouse Rocks
Region: 
Blackwood Canyon Area
Date and time of avalanche (best estimate if unknown): 
Mon, 12/14/2009 - 15:00
Location Map: 
United States
39° 8' 8.7108" N, 120° 14' 35.7288" W
See map: Google Maps
US


Red Flags: 
Recent avalanche activity
Recent loading by new snow, wind, or rain
Observation made by: Forecaster
Avalanche Observations
Avalanche Type: 
dry,slab,
Trigger type: 
Natural
Aspect: 
Northeast
Avalanche Width: 
300ft.
Terrain: 
Below Treeline
Elevation: 
8 200ft.
Avalanche Length: 
400ft.
More detailed information about the avalanche: 

The details of this slide are unknown. It looks to be about 300ft wide and runs downslope about 400 ft. It looks like it failed at the old new snow interface and propagated from tree to tree.

Avalanche Photos: 
Weather Observations
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: