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Observation: Turnagain

Location: Magnum - North aspects

Date:
Observer:
Route & General Observations

Toured up the NW shoulder of Magnum ridge to look at upper elevation wind loaded Northerly aspects that have not avalanched.

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

None

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

Sunny with significant inversion, 30F at 3,300' and 3F in the parking lot. Winds calm.

Snow surface

Wind effected - scoured, hard wind slab, wind crust.

Snowpack

Snowpit: Northerly aspect, ~30 deg and unsupported slope. This pocket was loaded by the winds from Dec 29 and Jan 5th. It is one of the areas we are concerned about for still being able to trigger a persistent slab avalanche. Total depth 75-115cm, ECTN 11RP 20cm down on stellars, ECTN 27 RP 45cm down small facets. See video.

Bottom line in the snowpack here: Poor structure, high strength and low propagation potential. The weak layer(s) exist, but the slab is so stiff it does not want to propagate a fracture - human triggering is unlikely.

Photos & Video
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