Leavitt Lake Cirque

Location Name: 
Leavitt Lake Cirque
Region: 
BWRA
Date and time of avalanche (best estimate if unknown): 
Sat, 04/01/2017 - 14:17
Location Map: 


Red Flags: 
Recent loading by new snow, wind, or rain
Rapid warming
Obvious avalanche path
Terrain Trap

Observation made by: Avalanche Specialist
Avalanche Observations
Avalanche Type: 
Slab
Slope: 
43degrees
Trigger type: 
Natural
Crown Height: 
8 ft
Aspect: 
East
Avalanche Width: 
100ft.
Terrain: 
Above Treeline
Elevation: 
9 200ft.
Bed Surface: 
Storm Snow
Avalanche Length: 
600ft.
Number of similar avalanches: 
1
Did the avalanche hit a building, vehicle, or structure?: 
No
More detailed information about the avalanche: 

It appears as a large piece of cornice broke from above Leavitt Lake in the Cirque. It likely happened later in the afternoon on Friday when winds were blowing the previous days 10cm of new snow. The debris fanned out in an already very deep deposition zone in point-release fashion.

Avalanche Photos: 
Snowpit or crown profile photo or graph: 
Above Sardine Creek
Sardine Pit
Sardine Test
Sled Slopecut
Weather Observations
Cloud Cover: 
Clear
Air temperature: 
Above Freezing
Wind Speed: 
Calm
Air temperature trend: 
Warming
More detailed information about the weather: 

Thursday nights snow has been dramatically blown around by winds predominately out of the North. The new 10cm snow has been wind packed into the slope & was unreactive to stability tests. Rapid mid-day warming has made the surface snow very moist & has been shedding itself later in the day, especially with human impacts.