Avalanche: Turnagain

Location: 3400' SW Eddies ridge

Date:
Observer:
Route & General Observations

Toured up toward eddies/Ingram creek drainage, skied sw face of Eddies. Observed recent natural avalanche activity from small (Half a refrigerator) cornice failure. Dusting of new snow, few clouds, wind was calm in the valley and on ridge. Cornice block seemed to trigger D2 slide that propagated around 50-100′ wide and 8-10″ deep.

 

Avalanche Details
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Trigger CorniceAvalanche Type Soft Slab
Aspect West SouthwestElevation 3400ft
Slope Angle 40degCrown Depth 10in
Width 50ftVertical Run 1500ft
Avalanche Details

Cornice block (Size of half a refrigerator) seemed to trigger D2 slide that propagated around 500-100'. Flushed out gully below.

We also triggered a SS-AS-R3-D2 at the top of our run, Similar elevation at 3400', slightly different aspect facing more South. propagated around 50' with 8-10" crown. Didn't jump any ridges on face. Soft slab flushed out rest of the path below. Failed on same surface as natural cornice slide, which seemed like buried surface hoar.

Red Flags
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Obvious signs of instability
Recent Avalanches?Yes
Collapsing (Whumphing)?No
Cracking (Shooting cracks)?No
Weather & Snow Characteristics
Please provide details to help us determine the weather and snowpack during the time this observation took place.
Weather

Few clouds, temps in teens, wind was calm in valley and on ridge. New dusting of snow.

Snow surface

smooth snow surface

Snowpack

No formal stability tests, was getting planar sheer with hand pits on the layer of buried surface hoar. Crust facet layer was beneath this layer. Crust seemed pretty supportable over facets, and nothing stepped down through layer from slide.

Photos & Video
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