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Observations

Region: Girdwood
Location: Orca
Observer: Anonymous
Date:

Route & General Observations

Orca North Chute – skier triggered sluff that triggered a small slab. No one was caught or injured.

Avalanche Details

Avalanche details

Trigger SkierAvalanche Type Soft SlabAspect North
Elevation 2500ftSlope AngleunknownCrown Depth 12in
Width 20ftLength 1000ft  

Observer Comments

A skier triggered dry loose sluff on a North chute of Orca, and stopped to let it pass by. Well below them the sluff triggered a small slab, ~12" thick and 20' wide that ran the remainder of the chute to the fan below. No one was caught, but sluff was heavy and fast moving and a powder cloud was seen after it triggered the slab.

Red Flags

Obvious signs of instability

Recent Avalanches?YesCollapsing (Whumphing)?NoCracking (Shooting cracks)?No

Observer Comments

Small skier triggered slab on North chute
The sluff on North aspects was surprisingly fast and heavy

Snow Characteristics

Snow surface

Very large and impressive surface hoar was observed on Orca at all elevations

Snowpack

The old bed surface was very firm and supportable

Photos & Video

Photos



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