Fresh deep slab in Rescue
Location Name: Forecaster Observation - Flathead Range Observation date: Saturday, January 25, 2020 - 16:15 |
Is this an Avalanche Observation: Yes |
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Observation made by: Forecaster
Tabs
Avalanche Details:
Date and Time of Avalanche:
Friday, January 24, 2020 - 12:30
Number of avalanches:
1
Avalanche Type:
Hard Slab
Failure Plane/Weak Layer:
Old snow
Trigger:
natural
Aspect:
Northeast
Starting Elevation:
above-treeline
Destructive Size:
D3 - Could destroy a car, a wood house, or snap trees
Relative Size:
R3 Medium
Crown Height:
8 ft
Avalanche Length (Vertical Run):
2600ft.
Avalanche Width (Average width):
350ft.
Avalanche Location:
Date and Time of Avalanche:
Friday, January 24, 2020 - 11:30
Number of avalanches:
2
Avalanche Type:
Wet Loose
Failure Plane/Weak Layer:
Within storm snow
Trigger:
natural
Aspect:
Northwest
Starting Elevation:
near-treeline
Destructive Size:
D2 Could bury, injure, or kill a person.
Relative Size:
R1 Very Small
Crown Height:
Less than 1 ft
Avalanche Length (Vertical Run):
350ft.
Avalanche Location:
Date and Time of Avalanche:
Friday, January 24, 2020 - 13:30
Number of avalanches:
2
Avalanche Type:
Soft Slab
Failure Plane/Weak Layer:
New/old snow interface
More information or comments about the avalanche:
2 wind slabs that were triggered by small spillovers of debris from the hard slab avalanche. Probably can all count as one avalanche event, but the distinction is to highlight surface instabilities yesterday as well.
Trigger:
natural
Aspect:
Northeast
Starting Elevation:
above-treeline
Destructive Size:
D1.5
Relative Size:
R1 Very Small
Crown Height:
1 ft
Avalanche Length (Vertical Run):
300ft.
Avalanche Width (Average width):
30ft.
Avalanche Location:
Date and Time of Avalanche:
Monday, January 20, 2020 - 12:30
Number of avalanches:
1
Avalanche Type:
Hard Slab
Failure Plane/Weak Layer:
Old snow
More information or comments about the avalanche:
Wild guess on the date. The crown wasn't visible during our last visit to the basin on Jan 15.
Trigger:
natural
Aspect:
North
Starting Elevation:
6300
Destructive Size:
D3 - Could destroy a car, a wood house, or snap trees
Relative Size:
R3 Medium
Avalanche Location:
Failed on ice crust near the ground. Weak layer above crust was 1.5-2.0 mm facets, slab was P to 1F hard. The slope above is heavily corniced, but didn't see any obvious evidence of a cornice fall. If there was one, it was relatively small.