Observation: Turnagain

Location: Tincan to 2600'

Route & General Observations

Tincan to 2600′
Ascended and descended normal up-track route

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 avalanche on CFR - likely occurred 12-11-15 mid storm when winds were gusting in the 40-50's mph. Debris was partially covered with new snow.

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

Winds calm
No Precip

Snow surface

1000'- 6" of new snow on 1" m/f crust, which occurred on 12-10-15
1100'- new m/f crust was gone by 1100' and 15" new snow was found
2000-2600' - average snow depth was 50cm (20")


Pit1 - 2200' on a SW aspect, 25* slope, HS=120 Test Results: ECTP15, ECTP17, ECTP20, Sudden Collapse (See photo diagram) - the Buried surface hoar (BSH) was found 50cm below the surface on 5" layer mostly rounding facets. These rounding facets were bonding together well, but had a thin layer of loose facets at the interface of the m/f crust. Test results showed propagation potential on the BSH layer. A moderate amount of force was required for the BSH layer to fail. The location was downhill of several hemlocks and is in a protected area.

Pit2 - 2600' on a SW aspect, 21*slope, HS=147, Test Results: ECTX (See photo diagram) - There was 57cm of new snow on an old snow layer of wind affected snow and 4F hard facets. The m/f crust from the Thanksgiving storm was 90cm below the surface. Pried the slab with my shovel and it broke below the 2cm m/f crust. Surface was very uneven. The location we chose was in a more wind exposed place, but a slightly leeward area adjacent to the ridge. Probed around a lot and the average height of snow was 150cm.

Photos & Video
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