Natural avalanche in Powderbowl

Location Name: 
Powderbowl
Region: 
Luther Pass Area (including Job and Freel)
Date and time of avalanche (best estimate if unknown): 
Sun, 01/17/2016 - 10:00
Location Map: 
United States
38° 47' 15.1296" N, 119° 58' 13.6812" W
See map: Google Maps
US


Red Flags: 
Recent avalanche activity
Whumphing noises, shooting cracks, or collapsing
Obvious avalanche path
Terrain Trap
Observation made by: Professional Observer
Avalanche Observations
Avalanche Type: 
Dry
Slab
Trigger type: 
Natural
Aspect: 
Northeast
Terrain: 
Below Treeline
Elevation: 
8 400ft.
Number of similar avalanches: 
1
More detailed information about the avalanche: 

This crown appeared to be from an avalanche that ran before the snow on 1/16. There were no observered ski tracks in the vicinity. There was a similar crown higher on the same NE ridge of Powderbowl. We were on the opposite ridge and the flat light made detailed observations difficult. 

Avalanche Photos: 
Weather Observations
Air temperature: 
Precipitation: 
Air temperature trend: 
Wind Direction: 
Accumulation rate: 
More detailed information about the weather: