Avalanche: Turnagain

Location: Eddies

Date:
Observer:
Route & General Observations

Eddies to 2700′

Avalanche Details
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Trigger UnknownAvalanche Type Unknown
Aspect UnknownElevationunknown
Slope AngleunknownCrown Depthunknown
WidthunknownVertical Rununknown
Avalanche Details

A few shallow, isolated wind slabs seen today. One on Eddies (pictured below) may have been remote triggered on March 11 or 12, with old slightly blown in tracks nearby. Dry loose naturals/small crowns visible on Sharks Fin (pictured below) from during or just after the storm, and one crown probably 100' wide on NW aspect of Wolverine, just at treeline, also with ski tracks nearby. A larger slab (D2?) was also visible across the arm on a NE aspect of Pyramid, with the crown midslope and partly blown in. Debris on this slide looked to have run ~500'

Red Flags
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Obvious signs of instability
Recent Avalanches?Yes
Collapsing (Whumphing)?Yes
Cracking (Shooting cracks)?Yes
Observer Comments

Cracking and collapsing around 1700' on Eddies NW face when skinning over wind drifts in the trees, near the recent avalanche depicted below. Large previous cracks near a down track from March 11 or 12 were also evident, though no further cracking from our tracks just adjacent today
Dry loose and small slides noted in Avalanche detail; glide cracks present still on Sunnyside and S aspect of Sharks Fin.

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

Clear and COLD in the AM, warming to teens up high midday. Calm.

Snow surface

8-10" of new, dry, low density snow from last week at the parking lot, increasing to 12-16" by treeline. West and NW road facing aspect was hit pretty hard by winds, leaving slabs or hard snow behind... only the sheltered part of the N aspect bowl had relatively soft snow, though even here there was some wind affect on the surface.

Snowpack

Quick hasty pits along the route showed that surface hoar that was buried this past week was still intact.
Pockets of windslab - 2 - 18" thick - along the route. Two pits at 2700', just below the Eddies headwall.

Pit 1: SW aspect facing towards Tincan, 2700', HS=400+cm, 20 degree slope (see below for structure)
CT 3 PC x2, ECTN 3 down 10cm. Slab was 1 finger wind packed particles over fist hard snow from last week.
CT 14, 15 SP, ECTP 16 down 40cm. Slab was new snow from last week over Buried Surface Hoar from 3/9.
CT 28, CTX down 60 cm. Thin weak layer of facets as depicted below.

Pit #2 was a N aspect just below the Eddies Headwall,100' away from the pit above. 2700', 10 degree slope, HS=320+cm
Test depth of 50cm to evaluate just the buried surface hoar, which was obviously visible in the pit wall.
CT 12, 13 SP and ECTN 13 down 40cm in the 3/9 BSH. Snow above was Fist hard surface -> 4 finger new snow from last week.

Photos & Video
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