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Observation: Turnagain

Location: Tincan

Date:
Observer:
Route & General Observations

10:15-4:15-Our group of three ascended the standard skin track to TL and assessed instability with a lap in the trees before ascending into Alpine. Moving into the alpine, we encountered a variable snow surface with heavy wind deposits within meters of unaffected, smooth snow. (2,500ft+). We conducted instability tests with no alarming results, and skied Tincan Common, while exiting in the lower meadows. My snowpack intentions were to find BSH/MLK Jr Layer, slab reactivity and assess the wind/recent snow events.

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

Recent loading within 12 hours was apparent with visual snow on/off of tree branches within treeline.
Localized collapsing at 3,000 ft+ on/ near convexities.

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

10:15-12:00 Few clouds present with temps within 20°F +/- with Light E Wind, VF 500-1,000ft

12:00-4:15 Gradually Broken skies, Sun Dog/ Halo present with OVC over Summit Lake Area.
Light Winds from E, with consistent temps in 20°F +/-.

Valley Fog lifted around 3pm and No Precip throughout entire day.

Snow surface

4-6cm of fresh, dry snow in areas unaffected by recent wind event.
Dendrites/Plates were widespread from 1,500ft+
Wind-affected areas contained approx 50cm+ additional snow compared to unaffected surfaces within meters.
No visually wind-scoured areas on Tincan, but was very obvious on N. sunburst, and E Seattle Ridge.
Ski/Boot PEN: 30/55cm

Snowpack

In general, the first 50-60cm below surface, which encompasses the 1/28-1/29 storm event, is becoming more cohesive, with additional compaction due to wind and no near-surface faceting observed (Due to hardness assessment).

The faceted, MLK Layer was present, but no surface hoar was observed.

Our tests were conducted above the ridgeline between Common/Hippy Bowl, at 3,080ft on a SW aspect, 21° Slope, -7°C.
*See SnowPilot for profile details*
Tests:
-STE @50cm below Surface
-CT 21 PC 55cm below surface on Decomposing Precip particles
-2x ECTX
-PST 60/100 SF on LOC (N/O interface) 70cm below surface (20200204)

Photos & Video
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