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Observation: Turnagain

Location: Seattle Ridge / Main Bowl / Repeat Offender

Date:
Observer:
Route & General Observations

Toured to 2800′, looked over into Main Bowl and Zero Bowl. Descended Repeat Offender.

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)?No
Cracking (Shooting cracks)?No
Observer Comments

Recent snowmachine triggered D1 wind slab lookers right of the uptrack. Recent looking D1 windslab in Zero Bowl below cornice. (See photos). Wet-loose avalanches and rollerballs seen on steep southerly aspects in the afternoon.

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

~2" new snow from last night, sunny, clear skies. Calm to light wind from the N-NW. Temperatures in the 20's F.

Snow surface

~2" new snow from last night. A melt-freeze crust is forming on solar aspects, more pronounced on steep slopes. Below the new snow and melt-freeze crust sits a widespread layer of 1F-4F wind slab, ranging from 6-12".

Snowpack

The 1F-4F wind slab near the surface was failing with easy to moderate force in hand pits on intact stellars. The snowpack on East and North aspects of Seattle Ridge is thin - probing along the uptrack revealed HS=55-80 cm. The deepest snow found was 135cm deep.

Dug two pits:

Pit 1: Main Bowl. 2815', NE aspect. HS=115 cm, but depths of 65-70 cm were found across the area. Found a 30cm 4F wind slab sitting on a 2" m/f crust over facets, then impenetrable crusts below. Did not dig below the hardest crusts. ECTN12 down 30cm above the 2" m/f crust.

Pit2: Repeat Offender. 2785', SE aspect. HS=135. Similar structure to Pit 1, but wind slab was 50cm deep. CT11, ECTN11 down 20cm on wind slab density change. CT14, ECTX down 50 cm on facets below m/f crust.

Photos & Video
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