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Avalanche: Turnagain

Location: Corn Biscuit

Route & General Observations

Standard Corn Biscuit up-track through trees, then stayed north, following the valley.

Avalanche Details
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Trigger NaturalAvalanche Type Wet Loose Snow
Aspect EastElevation 3500ft
Slope AngleunknownCrown Depthunknown
WidthunknownVertical Run 2000ft
Avalanche Details

Natural triggered point release avalanche on Seattle Ridge at 1310.

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)?Yes
Cracking (Shooting cracks)?No
Observer Comments

Isolated whumphing at 2,300 ft, in an area of shallow snowpack on a North aspect.

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

No new precipitation. Warm temperatures, little to no wind, strong sunshine all day long.

Snow surface

Around 1cm of near surface facets on northern aspects. Southern aspect were hard, frozen crusts. On the way down to the car, we skied a western aspect. We reached the car at around 1430, and the melt-freeze crust was still very hard and frozen.


We were looking for observations on the deep slab problem on northern aspects. On NNE slope below Corn Biscuit, pit dug on a 28 degree slope at ~2000'. Snow depth was 195cm, with 40cm of very obvious rounding basal facets. Test results: CT13RP@40 (basal facets), CT18SC@115 (unknown layer), ECTP30SP@140 (buried surface hoar). Main layer of concern was the buried surface hoar, found 55cm from the surface of the snow.

Photos & Video
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