Forecaster Observation - Wind Slab Avalanches, Marion Lake, Flathead Range

Location Name: 
Forecaster Observation - Wind Slab Avalanches, Marion Lake, Flathead Range
Region: 
Flathead Range - Middle Fork Corridor
Date and time of avalanche (best estimate if unknown): 
Mon, 12/19/2016 - 12:00
Location Map: 


Red Flags: 
Recent avalanche activity
Whumphing noises, shooting cracks, or collapsing
Recent loading by new snow, wind, or rain
Obvious avalanche path

Observation made by: Forecaster
Avalanche Observations
Avalanche Type: 
Dry
Slab
Slope: 
38degrees
Trigger type: 
Skier
Crown Height: 
1 ft
Aspect: 
East
Weak Layer: 
Within storm snow
Avalanche Width: 
30ft.
Terrain: 
Near Treeline
Elevation: 
7 200ft.
Bed Surface: 
Old Snow
Avalanche Length: 
60ft.
Number of similar avalanches: 
2
More detailed information about the avalanche: 

We were able to trigger small wind slab avalanaches safely from the ridge between Marion Lake and Dickey Creek in the Flathead Range. The avalanches were relatively small and very soft slab (the slab broke apart easily as it traveled downhill). 

Avalanche Photos: 
Avalanche observation video: 

December 19, 2016 - Wind Slab Avalanches, Marion Lake/Dickey Creek, Flathead Range

Weather Observations
Blowing Snow: 
Yes
Air temperature: 
Below Freezing
Wind Speed: 
Strong (Whole trees in motion)
Precipitation: 
Air temperature trend: 
Wind Direction: 
Southwest
Accumulation rate: 
More detailed information about the weather: 
Activity: 
Skiing