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Observation: Turnagain

Location: Tincan

Date:
Observer:
Route & General Observations

Time: 10:00-16:00

Route: Tincan lot up the normal generally west aspect to Tincan Common peak. Dug a pit 100 yards
west of the common peak on a SSW aspect; then laps and down along the skin track.

Weather: No winds and increasing clouds throughout the day – mostly sunny in the morning changing
to overcast by late afternoon. Temperatures in the low-20s to 32 degrees. A thin layer of valley fog
below 1000′ in the morning, rising to 1500′ by late afternoon.

Snowpack: 2-4″ of soft snow from the past week over a melt freeze layer at the parking lot, increasing
to 8-12″ by 2000′. Around 2500′ the early-December melt freeze crust starts dissipating, and 2-3′ of
soft settled powder – including the pronounced layer of buried surface hoar – sits on top of the
November melt freeze crust. See full profile below from 3150′ feet.

Instability: The toe of recent runout was observed below a SW aspect of Tincan, directly below the final
stretch to the top of Tincan Common. The starting zone, track, and total size of the debris pile couldn’t
be observed from our location.

No cracking, collapsing, or recent avalanche activity observed. Skiers and snowboarders skied the entire
SW face of Tincan common, including the steeper parts which were untracked as of this AM.

Pit results showed the buried surface hoar reacting under medium pressure with propagation potential.
Additionally, a thin, soft layer was sandwiched between two harder 4-finger layers from the past week’s
storms; this layer too showed reactivity under medium pressure, with the potential to propagate,
including an RB3 result (see video below). The grain type couldn’t be positively identified, though
guesses included 1-2mm surface hoar or decomposing/fragmented particles… but both seemed odd to
find there

Photos & Video
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