Slabby conditions on Grant Ridge
Location Name: Forecaster Observation - Grant Ridge, Flathead Range Observation date: Friday, December 14, 2018 - 14:00 |
Is this an Avalanche Observation: Yes |
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Observation made by: Forecaster
Tabs
Avalanche Details:
Date and Time of Avalanche:
Wednesday, December 12, 2018 - 08:00
Avalanche Type:
Soft Slab
Failure Plane/Weak Layer:
New/old snow interface
Trigger:
natural
Trigger Modifier:
Cornice Fall Triggered
Start Zone Slope Angle:
35
Aspect:
East
Starting Elevation:
above-treeline
Destructive Size:
D2 Could bury, injure, or kill a person.
Relative Size:
R3 Medium
Crown Height:
1 ft
Avalanche Length (Vertical Run):
500ft.
Avalanche Width (Average width):
100ft.
Avalanche Location:
Date and Time of Avalanche:
Wednesday, December 12, 2018 - 08:45
Avalanche Type:
Soft Slab
Failure Plane/Weak Layer:
New/old snow interface
More information or comments about the avalanche:
I was only able to view the fracture line from a distance.
Trigger:
natural
Start Zone Slope Angle:
40
Aspect:
Northeast
Starting Elevation:
above-treeline
Destructive Size:
D2.5
Relative Size:
R3 Medium
Crown Height:
2 ft
Avalanche Width (Average width):
250ft.
Avalanche Location:
Difficult to estimate size due to the fracture line being blown in by wind transport.