Avalanche: Turnagain

Location: NW Cornbiscuit - treeline, in the area that has not slid

Route & General Observations

Attempted a short tour up to Magnum/Cornbiscuit to gain info on upper elevations. Significant new snow of 30-40cm slowed down travel. 5 skiers in the group, as part of an avalanche course. Numerous pits were dug, some at 1400′, some at 2000′ in elevation. A whumpfing collapse occurred under our feet at 1400′ elevation on a W aspect below Cornbiscuit – (presumed to be the buried surface hour from 1/9). Our tour topped out just above treeline (around 2000′), and we chose to dig in a slightly wind affected area. One pit (HS 220cm) showed propagation of the buried surface hoar, with moderate strength, and very poor structure. And the other pit (HS 122cm) showed no surface hoar, but propagation of the Thanksgiving crust after 27 taps.

Avalanche Details
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Trigger NaturalRemote Trigger Unknown
Avalanche Type Soft SlabAspect South
Elevation 3500ftSlope Angle 40deg
Crown Depth 16inWidth 100ft
Vertical Run 300ft  
Avalanche Details

Many recent soft slab avalanches were observed at higher elevations (3000-3500' elevation) on South facing steep slopes up Superbowl

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)?Yes
Observer Comments

Whumphing under our feet at 1400' West aspect below Cornbiscuit. Recent natural soft slab avalanches up Superbowl at higher elevations above treeline R2D2 size on South aspects.

Weather & Snow Characteristics
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Snow surface

New snow of 30-40cm. Heavy wet below 1200', drying out by 2000'


Buried surface hoar present everywhere except for some isolated wind affected areas.

Photos & Video
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