Surface conditions southern Whitefish Range
Location Name: Forecaster Observation - Southern Whitefish Range Observation date: Friday, April 6, 2018 - 16:45 |
Is this an Avalanche Observation: Yes |
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Observation made by: Forecaster
Tabs
Avalanche Details:
Date and Time of Avalanche:
Friday, April 6, 2018 - 12:45
Avalanche Type:
Soft Slab
Failure Plane/Weak Layer:
Other - explain below
Trigger:
skier
Trigger Modifier:
Accidentally Triggered
Start Zone Slope Angle:
38
Aspect:
East
Starting Elevation:
above-treeline
Destructive Size:
D1 Relatively harmless to people.
Relative Size:
R1 Very Small
Crown Height:
1 ft
Avalanche Length (Vertical Run):
150ft.
Avalanche Width (Average width):
35ft.
Avalanche Location:
Date and Time of Avalanche:
Friday, April 6, 2018 - 08:30
Avalanche Type:
Loose Dry/ Sluff
More information or comments about the avalanche:
Did not access the slides and are unsure of the failure plane. They probably initiated within this weeks storm snow and eventually entrained all of the snow above last weekends sun crust.
Trigger:
natural
Start Zone Slope Angle:
35
Aspect:
South
Starting Elevation:
near-treeline
Destructive Size:
D1 Relatively harmless to people.
Relative Size:
R1 Very Small
Avalanche Length (Vertical Run):
300ft.
Avalanche Width (Average width):
30ft.
Avalanche Location:
It appears that a skier caught air and landed on a steep convexity initiating the slide. Resulting debris was sizable enough to knock someone off their feet.