Avalanche Swan Range

Location Name: Swan Range Observation date: Sunday, December 20, 2020 - 12:00	Is this an Avalanche Observation: Yes

Observation made by: Public

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Quick Observation

South of La Moose Lake

Snowpack, Avalanche, Weather Images:

Travel Details

Region:

Swan Range - East Side (Hungry Horse Reservoir access)

Activity:

Snowmobiling

Avalanche Details

Avalanche Details:

Date and Time of Avalanche:

Sunday, December 20, 2020 - 01:00

Number of avalanches:

Avalanche Type:

Soft Slab

Failure Plane/Weak Layer:

New/old snow interface

More information or comments about the avalanche:

This is a wind slab avalanche possibly triggered by a cornice fall. The fracture line is straight and wide, making us wonder if it failed on a buried layer of surface hoar.

Trigger

Trigger:

natural

Terrain

Start Zone Slope Angle:

Aspect:

Northeast

Starting Elevation:

6900'

Size

Destructive Size:

D2 Could bury, injure, or kill a person.

Relative Size:

R3 Medium

Crown Height:

2 ft

Avalanche Length (Vertical Run):

500ft.

Avalanche Width (Average width):

250ft.

Avalanche Location:

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