Northwest Avalanche Center

Observation: Public

All Observations

Observation Details

Name:
IM
Observation Date:
February 13, 2021
Submitted:
February 13, 2021
Zone or Region:
West North
Activity:
Skiing/Snowboarding
Location:
Herman Saddle area

Triggered Avalanches

Did you trigger any avalanches? 
Yes
Was it intentional? 
No
Avalanche Type:
Soft Slab
Size:
Size 1: Relatively harmless to people
Elevation:
NTL
Aspect:
SE
Comments:
Remote triggered in crossloaded feature from position where attached photo was taken. Slid on MFcr down ~20cm (new/old snow interface). 15m wide; 10-40cm crown; ran roughly 20m
Photo:

Signs of Unstable Snow

Did you see shooting cracks? 
Yes, Isolated
Did you experience collapsing or whumpfing? 
Yes, Isolated

Observations

Significant wind transport. M winds gusting S. N-NW. Windward features largely stripped and leeward features had drifts ranging from 20-80+cm. Slab properties observed on many of these.

Advanced Observations

Observed Avalanche Problem #1: 
Wind Slab
Comments: 
Specific distribution NTL. Appeared to be avalanching in terrain that developed MFcr over previous days of high pressure. Isolated BTL based on the terrain we traveled in.

Size: D1-D1.5
Likelihood: likely
Layer: MFcr 2/10?
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