No March Madness
Location Name: Forecaster Observation - Apgar Range and Lake McDonald Observation date: Tuesday, March 17, 2020 - 16:30 |
Is this an Avalanche Observation: Yes |
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Observation made by: Forecaster
Location
Tabs
Avalanche Details:
Date and Time of Avalanche:
Saturday, March 14, 2020 - 12:00
Avalanche Type:
Soft Slab
Failure Plane/Weak Layer:
New/old snow interface
Trigger:
natural
Start Zone Slope Angle:
36
Aspect:
Northeast
Starting Elevation:
5200
Destructive Size:
D1 Relatively harmless to people.
Relative Size:
R2 Small
Crown Height:
Less than 1 ft
Avalanche Length (Vertical Run):
50ft.
Avalanche Width (Average width):
85ft.
Avalanche Location:
Date and Time of Avalanche:
Monday, March 16, 2020 - 16:00
Number of avalanches:
1
Avalanche Type:
Wet Loose
Failure Plane/Weak Layer:
Within storm snow
More information or comments about the avalanche:
Trigger:
natural
Aspect:
West
Starting Elevation:
near-treeline
Destructive Size:
D1 Relatively harmless to people.
Relative Size:
R1 Very Small
Avalanche Length (Vertical Run):
45ft.
Avalanche Location:
Date and Time of Avalanche:
Saturday, March 14, 2020 - 12:15
Number of avalanches:
6
Avalanche Type:
Loose Dry/ Sluff
Failure Plane/Weak Layer:
Unknown
More information or comments about the avalanche:
Estimated from view through binoculars from Lake McDonald.
Trigger:
natural
Aspect:
Northwest
Starting Elevation:
7500
Destructive Size:
D1.5
Relative Size:
R2 Small
Avalanche Length (Vertical Run):
150ft.
Avalanche Location:
Seen from bridge over McDonald Creek. Thin crown that ran through the trees, w darker snow (old MFcr) as bed surface. Debris stopped on bench below. Guessing it ran at a similar time as similar sides in Cascadilla Creek this past weekend.