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Avalanche: Turnagain

Location: Sunburst

Date:
Observer:
Route & General Observations

Sunburst up track to about 1,700 ft in the alders with the Alaska Avalanche School Level 1 course.

Avalanche Details
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Trigger UnknownAvalanche Type Soft Slab
Aspect SouthwestElevation 3100ft
Slope Angle 40degCrown Depthunknown
WidthunknownVertical Rununknown
Avalanche Details

D2 avalanche happened today at approximately 1:45pm. Likely a remote trigger from a snowmachine traveling on the ridge.
Heard it but did not see the avalanche in motion, noticed it a few minutes later when sunshine showed the obvious fresh 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)?Yes
Cracking (Shooting cracks)?No
Observer Comments

2 whumphs at about 1,500 & 1,600 while traveling spaced out breaking trail to the climbers left of the typical up track.
3 recent (yesterday or last night) mid to late storm avalanches evident on sunny side SW aspect.
Then the avalanche that happened at approximately 1:45pm just south from the 3 naturals.

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

Broken skies, calm wind, temps just above freezing

Snow surface

3cm relatively supportable rain crust up to about 1,400 ft on surface. Above 1,400 ft wind affected snow surface.

Snowpack

Exciting day for snowpack observations! Whumphing, recent avalanches and exciting snow pits.
Snowpits at 1,700 ft clearly showed the New Years Eve surface hoar was reactive.
CT2Q1, CT15Q1, ECTP14 all on surface hoar layer about 65cm down.

Photos & Video
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