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Observations

Region: Turnagain
Location: Seattle Ridge - Main Bowl up to 2,800'
Observer:
Date:

Avalanche Details

Avalanche details

Trigger NaturalAvalanche Type Aspect West Northwest
Elevation 2300ftSlope AngleunknownCrown Depth 24in
Width 300ftLength 300ft  

Observer Comments

Natural trigger during rapid warming. Unknown weak layer

Red Flags

Obvious signs of instability

Recent Avalanches?YesCollapsing (Whumphing)?NoCracking (Shooting cracks)?No

Observer Comments

I did not experience collapsing or cracking. The party close to the avalanche reported collapsing and cracking (see Fennnell’s ob for more)

Weather

Weather

Warm, cloudy, no wind

Snow Characteristics

Snow surface

Snow surface was close to isothermal between 1,000-2,000’ upon descent at 2pm. Generally damp surface snow up to 2,400’.

Snowpack

Dug one pit on the skier’s left side of Main Bowl, 2,800’, ENE aspect. Test results showed high strength that went down the longer the pit wall was exposed to warm air and sun. High propagation potential, poor structure and moderate friction. Weak layer in this location is large surface hoar (8mm) mixed in with old facets 85 cm down sitting on a “concrete like”crust. See pit profile for more detail.

Photos & Video

Photos



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