Avalanche: Chugach State Park

Location: Ptarmagin peak

Route & General Observations

Rabbit lake parking, up Ptarmigan SW ridge, down S Couloir, up over Ptarmigan pass and out.
Surface hoar noted on lower elevations, as well as some sun crust on steeper southerly aspects. Both had disappeared by the time we were at Ptarmigan pass on the way up.

Avalanche Details
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Trigger SkierRemote Trigger No
Avalanche Type Soft SlabAspect North
Elevation 4100ftSlope Angle 45deg
Crown Depth 10inWidth 20ft
Vertical Run 200ft  
Avalanche Details

Ski cut of an unsupported slope in the S couloir triggered a soft slab D1. Slab was connected to bigger slopes but did not propagate past the unsupported terrain feature.

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?No
Collapsing (Whumphing)?No
Cracking (Shooting cracks)?Yes
Observer Comments

Some shooting cracks in steeper leeward terrain in uptrack on SW ridge. 5-15 cm deep. not much energy in the slabs, maybe they were older and not from 2/20 wind event.

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

Clear all day, light north winds on summit. We could feel the sun on our faces, but colder temps kept the snowpack from warming up.

Snow surface

Mix of wind affected snow, shallow coverage of some prominent terrain features, and really good skiing in protected terrain.

Photos & Video
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