Found a few signs of instability
Location Name: Forecaster Observation - Middle Fork Observation date: Saturday, April 4, 2020 - 17:15 |
Is this an Avalanche Observation: Yes |
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Observation made by: Forecaster
Tabs
Avalanche Details:
Date and Time of Avalanche:
Saturday, April 4, 2020 - 12:00
Number of avalanches:
1
Avalanche Type:
Wet Loose
Failure Plane/Weak Layer:
Within storm snow
Trigger:
unknown
Aspect:
Northwest
Starting Elevation:
below-treeline
Destructive Size:
D1 Relatively harmless to people.
Relative Size:
R1 Very Small
Crown Height:
Less than 1 ft
Avalanche Length (Vertical Run):
150ft.
Avalanche Width (Average width):
25ft.
Avalanche Location:
Date and Time of Avalanche:
Saturday, April 4, 2020 - 11:00
Number of avalanches:
10
Avalanche Type:
Loose Dry/ Sluff
Failure Plane/Weak Layer:
Within storm snow
More information or comments about the avalanche:
Many small sluffs ran in newer snow on the bed surface of the D2.5 remotely triggered avalanche reported 4/1.
Trigger:
natural
Aspect:
East
Starting Elevation:
near-treeline
Destructive Size:
D1 Relatively harmless to people.
Relative Size:
R1 Very Small
Crown Height:
Less than 1 ft
Avalanche Length (Vertical Run):
100ft.
Avalanche Width (Average width):
15ft.
Avalanche Location:
Date and Time of Avalanche:
Saturday, April 4, 2020 - 13:15
Number of avalanches:
3
Avalanche Type:
Wet Loose
Failure Plane/Weak Layer:
New/old snow interface
More information or comments about the avalanche:
Trigger:
skier
Trigger Modifier:
Intentionally Triggered
Start Zone Slope Angle:
50
Aspect:
North
Starting Elevation:
below-treeline
Destructive Size:
D1 Relatively harmless to people.
Relative Size:
R1 Very Small
Crown Height:
Less than 1 ft
Avalanche Length (Vertical Run):
25ft.
Avalanche Width (Average width):
6ft.
Avalanche Location:
Timing is estimated. Covered one of the skin tracks going up Cascadilla. Skiers skinned over the debris going back up.