Avalanche: Summit

Location: Tenderfoot

Date:
Observer:
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
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Trigger NaturalAvalanche Type Unknown
Aspect West SouthwestElevationunknown
Slope AngleunknownCrown Depthunknown
WidthunknownVertical Rununknown
Avalanche Details

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

Red Flags
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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.
Weather

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'

Snowpack

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
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