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Avalanche: Turnagain

Location: Main Bowl, Turnagain Pass

Date:
Observer:
Route & General Observations

Standard moto uptrack to Main Bowl.

Avalanche Details
If this is an avalanche observation, click yes below and fill in the form as best as you can. If people were involved, please provide details.
Trigger SnowmachinerAvalanche Type Soft Slab
Aspect SoutheastElevation 2400ft
Slope AngleunknownCrown Depth 24in
Width 300ftVertical Run 100ft
Avalanche Details

Three snowmachine triggered avalanche in Main Bowl today. I investigated one and found the Solstice BSH was weak layer, about 60cm down. Confident this was also the weak layer in the other two avalanches.
At least two of three slopes that avalanched had multiple tracks prior to avalanche.

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

Recent avalanches.

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

Calm winds. Single digit temps and high clouds.

Snow surface

12-20” low density snow from NYE storm.

Snowpack

Melt freeze crust from early in NYE storm is present below about 2200’. It disappears in the 2200-2300’ elevation band.
No formal stability tests but all three avalanches failed on buried surface hoar 50-60cm down.

Photos & Video
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