Avalanche: Turnagain

Location: Base of Seattle Ridge

Route & General Observations

Alaska Avalanche School Moto 2 field day. Followed the power line in search of sheltered snow for stability tests. Ended up near base of Seattle Ridge.

Avalanche Details
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Trigger NaturalRemote Trigger Unknown
Avalanche Type UnknownAspect Unknown
ElevationunknownSlope Angleunknown
Crown DepthunknownWidthunknown
Vertical Rununknown  
Avalanche Details

Wind slab avalanche seen north of the uptrack along Seattle Ridge.

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 slide down front side of Seattle Ridge at ~1200 ft. Likely a wind slab release from higher up.

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

Warm and stormy! 37F with a 10 mph breeze and ~18 mph gusts. Overcast skies and occasional light rain.

Snow surface

Becoming saturated, mid-calf to knee boot penetration. Minimal re-freeze last night.


Dug two pits at 960 ft in a semi-sheltered area near trees (NW aspect, 10deg). Both showed unexpected and near identical results: CTN, ECT17P Q3 at BSH 35-40 cm down (170 cm from base). Was able to identify the buried surface hoar fairly easy in both pits. January facet layer was un-reactive.

We then traveled further up the ridge to 1100 ft in search of another example of BSH. Pit #3 was un-reactive with no buried surface hoar observed.

Photos & Video
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