Avalanche: Turnagain

Location: Seattle Ridge

Route & General Observations

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

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 NaturalRemote Trigger Unknown
Avalanche Type Hard SlabAspect West Northwest
Elevation 2400ftSlope Angleunknown
Crown Depth 16inWidth 400ft
Vertical 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.

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.


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
Please upload photos below. Maximum of 5 megabytes per image. Click here for help on resizing images. If you are having trouble uploading please email images separately to staff.