Northwest Avalanche Center

Observation: Public

All Observations

Observation Details

Name:
Andrew
Observation Date:
December 14, 2021
Submitted:
December 15, 2021
Zone or Region:
Snoqualmie Pass
Activity:
Skiing/Snowboarding
Location:
Slot couloir

Triggered Avalanches

Did you trigger any avalanches? 
Yes
Was it intentional? 
Yes
Avalanche Type:
Soft Slab
Size:
Size 1: Relatively harmless to people
Elevation:
6000
Aspect:
N
Comments:
Multiple pockets about 30 ft wide and 8-12 inches deep broke at the top of the slot

Signs of Unstable Snow

None reported

Observations

Ski cut the slot on belay and cut multiple surface soft slab pockets at the entrance. The soft slabs were not very cohesive and failed to entrain much snow beneath them but ran the length of the couloir. The upper most turns were shallow on top of crust and the first pocket ran on a firm crust layer that was near the surface. Lower pockets ran on a storm interface.

Phantom trees is still quite bony with lots of branches and snags lurking under light snow. Slot apron also had several surprising sharks poking out and just beneath the surface at the bottom. Exited via snow lake and did not get good observations of the thunder exit.

Media

Public Field Report: Slot couloir
Public Field Report: Slot couloir
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