Avalanche: Turnagain

Location: Eddies

Date:
Observer:
Route & General Observations

Eddies to 2200′ (top of treeline)

Avalanche Details
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Trigger SkierRemote Trigger Yes
Avalanche Type Soft SlabAspect Northeast
Elevation 2200ftSlope Angle 38deg
Crown Depth 24inWidth 50ft
Vertical Run 70ft  
Avalanche Details

Spoke to a party that remote triggered (from ~50' away) a small but deep avalanche near Eddies treeline, and then went to take a peek - photos and crown profile are below. The avalanche failed on 1mm fist+ hardness facets sitting on top of the thick Thanksgiving Crust. The location showed signs of wind affect from the past week, with the crown varying in depth from 1-3'. The terrain feature was small and fairly steep, with blocks running on a 38+ degree slope. Cracking occurred above the crown, in places where the slope angle was in the mid-30s.

On a SE aspect, I also managed to trigger a small wind pocket (15'x15') that was 6" deep, and a thin recent wind slab was also touchy/easy to kick off at the site of this deeper small avalanche.

No other avalanche activity observed, though obscured skies and light snow limited visibility.

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

On top of avalanches, I had a deep sounding whumph on a steep SE aspect rollover near treeline (2200'), and shooting cracks in some wind loaded features (also near treeline).

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

Obscured skies, temps around 20, and light snow (no more than 1cm/hour) throughout the day.
Generally light variable winds, with some steady light winds at 2200' from the north or east.
1-2" of accumulation from 10:30 - 3:30.

Snow surface

Soft new snow, with ski penetration of 6-8" in areas that haven't experienced wind in the last week! At the parking lot (400') 10-12" of soft snow sits on the Thanksgiving Crust. This increases to ~24" by 1100', with 24-30" of soft snow found over the crust in wind protected areas to treeline.
Even a thin dusting of new snow could be found on wind scoured surfaces along the uptrack ridgeline.

Snowpack

See below for pit/snow structure at treeline.

Photos & Video
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