Reactive storm slabs in the flathead range.
Location Name: Forecaster Observation - Flathead Range Observation date: Wednesday, December 23, 2020 - 14:00 |
Is this an Avalanche Observation: Yes |
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Observation made by: Forecaster
Tabs
Avalanche Details:
Date and Time of Avalanche:
Tuesday, December 22, 2020 - 01:00
Number of avalanches:
5
Avalanche Type:
Wet Loose
Failure Plane/Weak Layer:
Within storm snow
Trigger:
natural
Start Zone Slope Angle:
38
Aspect:
East
Starting Elevation:
near-treeline
Destructive Size:
D2 Could bury, injure, or kill a person.
Avalanche Location:
Date and Time of Avalanche:
Tuesday, December 22, 2020 - 12:00
Avalanche Type:
Unknown
More information or comments about the avalanche:
Visibility made it so I could not determine what kind of avalanche this was. We observed debris mid slope with runneled looking snow above it. I would suspect either a cornice fall or a hard slab avalanche.
Trigger:
natural
Start Zone Slope Angle:
40
Aspect:
Southeast
Starting Elevation:
above-treeline
Destructive Size:
D2 Could bury, injure, or kill a person.
Avalanche Location:
Date and Time of Avalanche:
Wednesday, December 23, 2020 - 12:00
Number of avalanches:
3
Avalanche Type:
Soft Slab
Failure Plane/Weak Layer:
New/old snow interface
More information or comments about the avalanche:
Reactive storm snow where winds stiffened slabs.
Trigger:
skier
Trigger Modifier:
Intentionally Triggered
Start Zone Slope Angle:
38
Aspect:
Southeast
Starting Elevation:
above-treeline
Destructive Size:
D1.5
Relative Size:
R3 Medium
Crown Height:
1 ft
Avalanche Length (Vertical Run):
200ft.
Avalanche Width (Average width):
50ft.
Avalanche Location:
Estimated time.