Avalanche: Girdwood

Location: Orca

Route & General Observations

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

Avalanche Details
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Trigger SkierRemote Trigger0
Avalanche Type Soft SlabAspect North
Elevation 2500ftSlope Angleunknown
Crown Depth 12inWidth 20ft
Vertical Run 1000ft  
Avalanche Details

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
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Obvious signs of instability
Recent Avalanches?Yes
Collapsing (Whumphing)?No
Cracking (Shooting cracks)?No
Observer Comments

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

Weather & Snow Characteristics
Please provide details to help us determine the weather and snowpack during the time this observation took place.
Snow surface

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


The old bed surface was very firm and supportable

Photos & Video
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