Avalanche: Turnagain

Location: Cornbiscuit

Date:
Observer:
Route & General Observations

Cornbiscuit to 3500′ – down a north aspect, then back around to 3300′ on a SW aspect to check out a recently released glide crack!

Avalanche Details
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Trigger NaturalAvalanche Type Hard Slab
Aspect South SouthwestElevation 3300ft
Slope Angle 37degCrown Depth4ft
Width 150ftVertical Run 100ft
Avalanche Details

Glide crack released on Cornbiscuit that wasn't present on 12/26, when it would have been observed from Lipps. This crack likely released late last night or this AM, as there was no snow on the bed surface which looked to be tundra and grass. We dug a pit just upslope from it; see photos and pit structure below!

Three new glide cracks formed on a SW aspect of Magnum, just skiers left of PMS bowl. These cracks weren't present on 12/24.

Glide cracks noted earlier in the week in the Lynx Creek drainage remain unchanged as reported on 12/24.

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

Glide cracks forming and releasing

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

Few clouds transitioning to overcast mid-day with patchy valley fog
Temps in the teens
Light north winds on ridgeline, with a few moments of sustained moderate N winds as the sky transitioned
Very light snowfall late afternoon.

Snow surface

1-2" of snow fell on 12/27, with small surface hoar present over much of the route.
Ski penetration of 4-8" down low, and 2-6" above treeline.
Some wind affect present but surface snow still fist hard.

Snowpack

The top 70-100+cm of the snowpack continues to be right side up, sitting over a crust sandwich that sits on moist rounding facets over a not frozen ground.

As depicted below, compression tests showed no results at our pit location.

Photos & Video
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