Avalanche: Summit

Location: Tenderfoot

Route & General Observations

Toured the standard Tenderfoot up-track to 3300′.
While driving through Turnagain Pass we observed a large new glide avalanche on the WSW face of Eddies.
Obvious scouring and loading from the last storm on February 4/5 in the Alpine. Persistent weak layers are still present in the snowpack.

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 Trigger0
Avalanche Type UnknownAspect West Southwest
ElevationunknownSlope Angleunknown
Crown DepthunknownWidthunknown
Vertical Rununknown  
Avalanche Details

Recent glide release, sometime late 2/10-early 2/11

Red Flags
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Observer Comments

Significant roller balls, surface snow was becoming wetter and more cohesive

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

Mixture of overcast and obscured.
Light snow/rain. Rain line was around 2100'
Temps in 30s
ENE winds 15-25, gusty around 2pm.

Snow surface

1200'-2100' rain saturated snow 1-2" deep with moist snow below.
2100'-3300' 1-3" of moist snow over drier snow (8-10" settled storm)
Wind was creating roller balls around 2500', ridgeline snow wasn't being transported until around 3000'


Pit #1: 2300' West aspect, 28 degree slope, HS=185, dug to 135 cm. We found buried surface hoar (BSH) 40 cm below the surface (interface between the February 4/5 storm an older snow (ECTN 15, CT 20) There is another layer of (BSH) 70 cm below the surface. This layer was not reactive in tests.

Pit #2: 3300' South aspect 24 degree slope, HS=80. Multiple layers of wind compacted snow over 10-20 cm of facets, 1-2mm.
@ 40 cm below surface: ECTP 21 SC, CT 16 SC x2 on the interface between Feb. 4/5 storm and old snow (small facets= .5)

No hand pit or test slope results.

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.