Avalanche: Turnagain

Location: Sunburst

Avalanche Details
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Trigger NaturalRemote Trigger0
Avalanche Type0Aspect East
Elevation 2300ftSlope Angleunknown
Crown Depth 24inWidthunknown
Vertical Rununknown  
Avalanche Details

Numerous slabs released on Seattle Ridge in the afternoon. D1s and D2s See photos

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

Observed several D1 & D2 slabs that released on Seattle Ridge during the day (see photos)
Wet loose activity on steep sunlit slopes
Minimal cracking underfoot along ascent ridge in previously wind loaded areas
No collapsing

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

Periods of light snowfall in the morning less than 1” accumulation
Calm wind
Mild temps, 32 F @ 1,000’ @ 10am, 37 @ 3pm
Mostly cloudy changing over to mostly sunny by 4pm

Snow surface

1,000-2,000’ - 8-10” new snow
2,000-3,300’ - 16-20” new snow


Test results in 3 locations today showed the storm snow to be well bonded to underlying surfaces. No propagation in tests and generally “right side up” new snow. Snowpack structure in the lower elevations has a slab sitting on a thick layer of wet snow.

1. 2,900’ W aspect, HS=190cm, no remarkable results
2. 3,300’ W aspect, HS=300cm, storm snow=24”
3. 1,700’ S aspect, HS=130cm, storm snow=12”, sitting on weak, wet snow

Photos & Video
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