Avalanche: Turnagain

Location: Seattle Ridge, 2nd Bowl (Jr's Bowl)

Date:
Observer:
Route & General Observations

Rode to the weather station and down into Jr’s Bowl and the lower non-wind affected areas.

Avalanche Details
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Trigger SnowmachinerAvalanche Type Soft Slab
Aspect NortheastElevation 2000ft
Slope AngleunknownCrown Depth 24in
Width 300ftVertical Run 600ft
Avalanche Details

Rider triggered avalanche while sidehilling lower on the slope. The slab directly above him broke first, then the slab on the looker's right and last was the slab on the looker left. All one right after the other. The whole avalanche, all three parts, was around 300' wide. Rider was alerted via radio and rode away from the base of the slope ahead of the debris, and was not caught.

Avalanche is believed to have failed in small facets around 1-2 feet below the surface. The larger facets (MLK Jr layer deeper in the snowpack) were not a factor in this slide. The slab was very soft. Warming and settlement in the top layer of the snowpack is thought to have played a factor in the slab character over the known weak layer.

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

Recent wind slab seen in Zero Bowl at the beginning of the day. Likely from winds Monday.
Small pockets of slab were releasing on small slopes in the lower drainage.

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

Mostly sunny skies.
Calm winds.
Temperatures in the mid 20's to 30F, warm feeling.

Snow surface

2-3" of new snow over prior wind effected areas along and near ridgeline. Old wind crusts and slabs under the new snow.
Non wind affected areas, soft settled powder.

Photos & Video
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