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Observation: Turnagain

Location: Sunnyside; Warmup Bowl and Main Bowl

Date:
Observer:
Route & General Observations

Standard uptrack, then along the ridge to Warm Up bowl; then two laps in Main bowl.

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?No
Collapsing (Whumphing)?Yes
Cracking (Shooting cracks)?No
Observer Comments

Collapsing along the ridge above Warm Up Bowl; hand pits failing on isolation in this location, with slabs up to 15" thick.

Glide crack observed over Warm Up Bowl, on a SE aspect. (See photo below).

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

Broken skies, light variable winds, temps in the 20s

Snow surface

Highly variable surface above treeline on the road facing aspect, including wind scoured areas and shallow windslabs on cross loaded features (see photo below). Additionally, some areas on road aspects and along the ridge top featured a very thin crust on the surface, along with some rimed grains... it appeared to have formed after last week's snow, up to 2200'. Maybe some warm air from the valley got pushed up, or the storm ended with a little rain? The crust seemed odd given nearby weather station data.

In main bowl, 4-6" of new snow - generally upside down - sat over facets.

Snowpack

Pit data from a slightly wind loaded area of main bowl:
2700', NW aspect, 15 degree slope, HS=140cm
CT4 PC, CT5 PC down 20cm on the facet/surface hoar interface buried last week.
ECTP1, but the propagation barely made it across the entire block in the test.

Photos & Video
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