Avalanche: Turnagain

Location: Cornbiscuit Alder Line West

Route & General Observations

Wooded uptrack to alder glades then exit alder glades to road.

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 No
Avalanche Type GlideAspect South Southeast
Elevation 3100ftSlope Angleunknown
Crown DepthunknownWidthunknown
Vertical Rununknown  
Avalanche Details

Recent glide avalanche below Seattle Ridge on motorized side. Also noted shallow storm releases on the same aspects.

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

One very localized small whumph at ~ 1400' otherwise no obvious traveling red flags. Light flagging showing snow transport off the top of Magnum to the north. Recent glide avalanche on Seattle Ridge side(see photo) as well as shallow (mid storm?) releases that did not run far off S to SE aspects.

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

Clearing trend mid morning with fog layer in and out. Then increasing high clouds and increasing snowfall in the afternoon. Light to moderate winds observed at ridgetop as evidenced by snow transport to north aspects.

Snow surface

Crust with 1cm moist snow on the surface at and above the road. Crust rapidly disappeared at 1400' to become soft snow surface above that.


See attached snow profile for new snow stratigraphy at ~1900'. The new snow seemed to be gaining strength rapidly with snow pack tests showing low energy shears and low propagation potential. Buried surface hoar was variable but generally observed between 30cm to 55cm down and not very reactive. Thanksgiving crust was observed between 100-170cm and still showing propagation potential (PST65/160cmEnd) but did not feel super uniform nor weak at this location.

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.