Forecaster Observation - Previous Widespread Avalanches, Lost Johnny, Swan Range

Location Name: 
Forecaster Observation - Previous Widespread Avalanches, Lost Johnny, Swan Range
Region: 
Swan Range - East Side (Hungry Horse Reservoir access)
Date and time of avalanche (best estimate if unknown): 
Mon, 02/13/2017 - 12:00


Red Flags: 
Recent avalanche activity
Observation made by: Forecaster
Avalanche Observations
Avalanche Type: 
Dry
Trigger type: 
Natural
More detailed information about the avalanche: 

Widespread natural avalanches occurred during the 2 major storms from 2/3 to 2/10/2017.  We observed avalanches on every aspect and at all elevations. Crown depths varied, but avalanches propagated far and wide. Many avalanches released on the widespread layer of facets above the Jan. 19 melt-freeze crust.

See the observation for the 2/4/2017 avalanche incident that resulted in one full and one partial burial. 

Avalanche Photos: 
Avalanche observation video: 

February 13, 2017 - Surveying the Carnage

Weather Observations
Cloud Cover: 
Clear
Air temperature: 
Below Freezing
Wind Speed: 
Calm (No air motion)
Air temperature trend: 
Warming
Wind Direction: 
Southwest
More detailed information about the weather: 

Clear skies, calm wind, and below freezing temperature all day.

Activity: 
Snowmobiling