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.