Northwest Avalanche Center

Observation: Public

All Observations

Observation Details

Name:
PHILIPPE LE MOUEL
Observation Date:
December 11, 2022
Submitted:
December 11, 2022
Zone or Region:
Olympics
Activity:
Skiing/Snowboarding
Location:
Hurricane Ridge

Observed Avalanches

Did you observe any avalanches? 
Yes
Avalanche Type:
Soft Slab
Size:
Size 2: Could bury, injure, or kill a person
Elevation:
5200ft
Aspect:
NW
Comments:
A skier triggered the avalanche from a milder slope above, which was connected to the problem slope. The crack propagated over quite a large distance and enough snow was released to bury or injure a skier. Some of the snow piled quite deep in front of trees along the avalanche path, which could have been a serious situation for any body caught in those spots. Fortunately the slab wasn't too deep at most 1ft at the deepest points.

Signs of Unstable Snow

Did you see shooting cracks? 
Yes, Isolated
Did you experience collapsing or whumpfing? 
No

Observations

There is a thin layer of surface hoar that is buried (less than a foot deep) in some locations with potentially wind slab or storm slab on top of it. This creates a very unstable situation with observed avalanche and shooting cracks in those locations. It seems that W/NW aspects are more affected. I didn't find that same problem on South facing slopes. My snow pit on a south facing slope didn't reveal any major instability, but that could just be because the surface hoar got blown away in that particular location.

Media

View from the debris field
Public Field Report: Hurricane Ridge
Public Field Report: Hurricane Ridge
Surface hoar at the bottom of the slab

Advanced Observations

Observed Avalanche Problem #1: 
Wind Slab
Comments: 
NW slope a few inches to a foot deep with potentially surface hoar underneath
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