Avalanche: Chugach State Park

Location: N side Eagle River valley

Route & General Observations

Soft slab slides triggered by snowblower at bases of slopes above 2 driveways.

Avalanche Details
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Trigger UnknownRemote Trigger Yes
Avalanche Type Soft SlabAspect South
Elevation 1600ftSlope Angleunknown
Crown Depth 20inWidth 70ft
Vertical Run 20ft  
Avalanche Details

Running a snowblower along the base of a slope on a mountainside driveway in about 20" of new snow during 12/7 storm. While making the first pass, depositing snow uphill about 10', the snow pack fractured about 20' up on the cut bank below the trees and propagated behind me for about 20' and ahead, on the slope above the house, for about 50'. Slope angle 30º or greater; no wind during the storm; the slide went full depth of the new snow. Similarly, the new snow failed as a soft slab on a much shorter slope below the road just as I cut along the base of it, not depositing snow on it (photo). Shooting cracks observed here.

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

Shooting cracks seen on smaller slope.

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

Steady snow, calm, about 21ºF.

Snow surface

Soft, new, small-grained snow (somewhat sandy texture).

Photos & Video
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