Forecaster Observation - Small Slab Avalanche in Lost Johnny, Swan Range

Location Name: 
Forecaster Observation - Lost Johnny, Swan Range
Region: 
Swan Range - East Side (Hungry Horse Reservoir access)
Date and time of avalanche (best estimate if unknown): 
Sat, 03/12/2016 - 00:00
Location Map: 

Red Flags: 
Recent avalanche activity
Recent loading by new snow, wind, or rain
Observation made by: Forecaster
Avalanche Observations
Avalanche Type: 
Slab
Trigger type: 
Natural
Crown Height: 
Less than 1 ft
Aspect: 
Northwest
Avalanche Width: 
40ft.
Terrain: 
Below Treeline
Elevation: 
6 000ft.
Avalanche Length: 
300ft.
More detailed information about the avalanche: 

Due to flat light and long distance it was difficult to estimate the crown depth and weak layer/bed surface. The avalanche occurred on a north facing slope on the opposite side of the drainage from the road. We were near the end of the road when we observed the avalanche.

Avalanche Photos: 
Weather Observations
Blowing Snow: 
No
Cloud Cover: 
100% of the sky covered by clouds
Air temperature: 
Above Freezing
Wind Speed: 
Light (Twigs in motion)
Precipitation: 
Mixed rain and snow
Air temperature trend: 
Static
Wind Direction: 
South
Accumulation rate: 
Less than 1 in. per hour
Activity: 
Snowmobiling