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Avalanche: Turnagain

Location: Tincan Trees

Date:
Observer:
Route & General Observations

AAS Level 1 class toured up through the Tincan trees, north of the standard skin track.

Avalanche Details
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Trigger UnknownAvalanche Type Soft Slab
Aspect UnknownElevationunknown
Slope AngleunknownCrown Depthunknown
WidthunknownVertical Rununknown
Avalanche Details

We saw several D1 soft slabs on convex rollovers as we made our way up to treeline. Also saw a D2 soft slab in Hippy Bowl. Trigger unknown, could've been a cornice release from the ridgeline onto the slightly wind loaded slope below. Debris ran a good distance downhill.

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

We experienced a few whumphs as we made our may up through the lower elevation meadows.

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

Good conditions. Mostly cloudy with a few sun breaks, light winds, light snow flurries, temps warming a bit through the afternoon

Snow surface

Great riding conditions with 30 cm of F hard to 4F new snow. New snow stiffened up some through the day as temps warmed.

Snowpack

Dug a couple of test pits around 1250 ft on a NW facing 25 degree slope after experiencing several whumphs. Found 30 cm of new snow on top of a fragile 2-3 cm crust overlaying likely facets/rounding facets. HS was ~150 cm.

Test results: ECTN16, ECTP5, ECTP8, ECTP22 all failing on the facets below the crust (~35 cm down). All ECTPs propagated with a sudden collapse.