Avalanche: Turnagain

Location: Seattle Ridge

Date:
Observer:
Route & General Observations

A look at Seattle Ridge and the back bowls after the significant winds yesterday, Thursday 2.11.21.

Avalanche Details
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Trigger NaturalAvalanche Type Hard Slab
Aspect West NorthwestElevation 2400ft
Slope AngleunknownCrown Depth 16in
Width 400ftVertical Run 250ft
Avalanche Details

Natural wind slab avalanche in Main Bowl (1st Bowl). Around 400' wide and crown face 1-2' in depth.

Several other natural wind slabs triggered by Thursday's winds seen. Many were blown in to some degree. The one mentioned above was the largest and most recent looking slab.

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

Mostly sunny
Light to moderate east winds. Some pluming and snow transport along ridgelines.
Temps near 20F

Snow surface

The snow surface is wind pummeled.... Winds have blown away much of the loose surface snow, not just into slabs, but away back into the atmosphere...
Wind slabs exist in pockets on many slopes, but there was more scouring than loading in this area.

Snowpack

We dug one quick pit under Jr's Run at 1,600'. Wind slab was up to a foot thick and sitting on buried surface hoar with facets underneath. Slab wants to fail on buried surface hoar and not facets in areas we poked around.

Photos & Video
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