Weak snow surface in Skiumah
Location Name: Forecaster Observation - Skiumah Lake, Flathead Range Observation date: Monday, December 11, 2017 - 12:15 |
Is this an Avalanche Observation: Yes |
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Observation made by: Forecaster
Tabs
Avalanche Details:
Date and Time of Avalanche:
Saturday, December 2, 2017 - 17:15
Avalanche Type:
Hard Slab
Failure Plane/Weak Layer:
Unknown
Trigger:
natural
Aspect:
North
Starting Elevation:
above-treeline
Destructive Size:
D2 Could bury, injure, or kill a person.
Relative Size:
R2 Small
Crown Height:
2 ft
Avalanche Location:
Date and Time of Avalanche:
Wednesday, November 22, 2017 - 17:45
Avalanche Type:
Unknown
Failure Plane/Weak Layer:
Unknown
More information or comments about the avalanche:
Numerous piles of old wet debris, up to D2.5 in size, from our Thanksgiving rain and avalanche cycle.
Trigger:
natural
Aspect:
North
Starting Elevation:
above-treeline
Destructive Size:
D2.5
Relative Size:
R3 Medium
Avalanche Location:
There were two avalanches that appeared to originate high on Mt Penrose (presumably a wind slab?), and their moving debris gouged out hard slabs at the aprons of the chutes. There were blocks of hard slab debris up to 2 feet thick. The debris was fairly recent; I would estimate they failed during our last storm.