Deep snow, small slides
Location Name: Forecaster Observation - upper Whitefish River Observation date: Saturday, February 27, 2021 - 20:00 |
Is this an Avalanche Observation: Yes |
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Observation made by: Forecaster
Tabs
Avalanche Details:
Date and Time of Avalanche:
Saturday, February 27, 2021 - 14:30
Number of avalanches:
1
Avalanche Type:
Loose Dry/ Sluff
Failure Plane/Weak Layer:
New/old snow interface
Trigger:
natural
Start Zone Slope Angle:
40
Aspect:
South
Starting Elevation:
near-treeline
Destructive Size:
D2 Could bury, injure, or kill a person.
Relative Size:
R2 Small
Avalanche Length (Vertical Run):
550ft.
Avalanche Location:
Date and Time of Avalanche:
Saturday, February 27, 2021 - 14:30
Number of avalanches:
3
Avalanche Type:
Loose Dry/ Sluff
Failure Plane/Weak Layer:
New/old snow interface
More information or comments about the avalanche:
Not there in the AM; clearly visible by mid afternoon. Steep, rocky terrain w lots of potentail triggers.
Trigger:
natural
Start Zone Slope Angle:
40
Aspect:
South
Starting Elevation:
near-treeline
Destructive Size:
D2 Could bury, injure, or kill a person.
Avalanche Length (Vertical Run):
550ft.
Avalanche Location:
Date and Time of Avalanche:
Saturday, February 27, 2021 - 10:30
Number of avalanches:
1
Avalanche Type:
Soft Slab
Failure Plane/Weak Layer:
New/old snow interface
More information or comments about the avalanche:
Looked to have been triggered by snowmobiler sidehilling top of steep cutbank
Trigger:
snowmobiler
Aspect:
Southwest
Starting Elevation:
4800
Destructive Size:
D1.5
Relative Size:
R2 Small
Crown Height:
1 ft
Avalanche Length (Vertical Run):
20ft.
Avalanche Width (Average width):
40ft.
Avalanche Location:
Date and Time of Avalanche:
Friday, February 26, 2021 - 16:30
Number of avalanches:
4
Avalanche Type:
Loose Dry/ Sluff
Failure Plane/Weak Layer:
Within storm snow
More information or comments about the avalanche:
Small fans of debris on snow surface, with a little new snow on top.
Trigger:
natural
Start Zone Slope Angle:
40
Aspect:
West
Starting Elevation:
near-treeline
Destructive Size:
D1 Relatively harmless to people.
Relative Size:
R1 Very Small
Avalanche Length (Vertical Run):
60ft.
Avalanche Location:
Largest sluff seen today. Steep, rocky terrain with lots of potential triggers and feeder chutes. Solar triggered. Not there in the AM; visible by mid afternoon.