Blue-bird, calm winds, and variable conditions
Location Name: Forecaster Observation - Ousel Peak to Skiumah Lake, Flathead Range Observation date: Monday, February 12, 2018 - 13:00 |
Is this an Avalanche Observation: Yes |
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Observation made by: Forecaster
Location
Tabs
Avalanche Details:
Date and Time of Avalanche:
Thursday, February 8, 2018 - 23:00
Avalanche Type:
Hard Slab
Failure Plane/Weak Layer:
Unknown
Trigger:
natural
Aspect:
Northeast
Starting Elevation:
above-treeline
Destructive Size:
D3.5
Relative Size:
R4 Large
Avalanche Length (Vertical Run):
2600ft.
Avalanche Width (Average width):
1000ft.
Number of people caught:
0
Avalanche Location:
Date and Time of Avalanche:
Thursday, February 8, 2018 - 23:00
Avalanche Type:
Hard Slab
Failure Plane/Weak Layer:
Unknown
Trigger:
natural
Aspect:
North
Starting Elevation:
above-treeline
Destructive Size:
D3 - Could destroy a car, a wood house, or snap trees
Relative Size:
R3 Medium
Avalanche Length (Vertical Run):
1400ft.
Avalanche Width (Average width):
500ft.
Number of people caught:
0
Avalanche Location:
Date and Time of Avalanche:
Thursday, February 8, 2018 - 23:00
Avalanche Type:
Hard Slab
Failure Plane/Weak Layer:
Old snow
Trigger:
natural
Aspect:
North
Starting Elevation:
near-treeline
Destructive Size:
D2 Could bury, injure, or kill a person.
Relative Size:
R3 Medium
Avalanche Length (Vertical Run):
500ft.
Avalanche Width (Average width):
200ft.
Number of people caught:
0
Avalanche Location:
Date and Time of Avalanche:
Sunday, February 11, 2018 - 12:00
Avalanche Type:
Hard Slab
Failure Plane/Weak Layer:
Within storm snow
More information or comments about the avalanche:
Multiple natural wind-slabs observed on northwest to northeast aspects.
Trigger:
natural
Starting Elevation:
above-treeline
Destructive Size:
D1 Relatively harmless to people.
Relative Size:
R2 Small
Crown Height:
Less than 1 ft
Avalanche Length (Vertical Run):
200ft.
Avalanche Width (Average width):
50ft.
Number of people caught:
0
Lighting was poor to get good picture from Skiumah Lake, but multiple large crows were visible and a portion of slope below ridgeline slide to the ground.