Public Observation - Swan Range Avalanche

Location Name: 
Public Observation - Swan Range Avalanche
Region: 
Swan Range - South (south of Swan Lake)
Date and time of avalanche (best estimate if unknown): 
Tue, 02/09/2016 - 12:00
Location Map: 

Red Flags: 
Recent avalanche activity
Recent loading by new snow, wind, or rain
Rapid warming
Obvious avalanche path
Observation made by: Public
Avalanche Observations
Avalanche Type: 
Dry
Slab
Slope: 
38degrees
Trigger type: 
Natural
Crown Height: 
2 ft
Aspect: 
Northeast
Weak Layer: 
Unknown
Terrain: 
Near Treeline
Elevation: 
7 700ft.
More detailed information about the avalanche: 

This avy ob is probably outdated and certainly outside of your forecast area, but I thought I'd send it in! We noticed this on Tuesday (2/09), likely occured during the weekend prior. Potential trigger likely a cornice failure. Notice avalanche stepped down to deeper layer in the starting zone. Triggered at 7700', terminated at 7100'.

Avalanche Photos: 
Activity: 
Skiing