Avalanche: Turnagain

Location: Seattle Ridge

Date:
Observer:
Route & General Observations

Lots of wind loading below Seattle Ridge. We were skinning through what later became the slidepath and noticed about 3 feet of soft wind loaded snow. At the top of our next run, we saw that the slope had ripped.

Contact, Location & General Observations
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Forecaster Comments

It is very likely this slide was remotely triggered while the party was on the ridge and the slope was out of view. Follow-up with a member of the party reported they felt a collapse while they were on the ridge.

Avalanche Details
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Trigger NaturalAvalanche Type 
Aspect NorthwestElevation 2100ft
Slope Angle 35degCrown Depth3ft
Width 600ftVertical Run 300ft
Observer Comments

Very soft slab.

Red Flags
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Obvious signs of instability
Recent Avalanches?Yes
Collapsing (Whumphing)?Yes
Cracking (Shooting cracks)?Yes
Observer Comments

We were able to see the recent avalanche off of Basketball (Magnum/Taylor Pass), which is a very similar aspect to this avalanche.

We saw some cracks open up on the apex of several convex terrain features nearby.

We saw some smaller sloughs in the area as well and got some whoomping on the flats of the ridge itself.

Weather & Snow Characteristics
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Weather

It was warm and the cracking, whoomping, and sliding all occurred at the warmest point in the day, right after the temperature seemed to climb a bit.

Snow surface

Soft, wind-deposited powder.

Photos & Video
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