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Observation: Turnagain

Location: Tincan Common to 2375'

Date:
Observer:
Route & General Observations

We toured up to 2100 feet on Tincan Common via the center ridge parking lot.

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

We witnessed two small, shallow, human-triggered avalanches on Tincan Common. Additionally, we experienced strange, isolated whumphing at the 1500 foot level during our tour, prior to intersecting the main skin track on Tincan. The Whumphs were noted by all in our group of 8.

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

Skies were initially obscured with precip falling (as snow) up to an inch per hour, then transitioning to broken after 13:00 hours. Temps were mild, hovering around the high-twenties at 2000 feet. Winds were strong out of the NE in the beginning, but reduced to calm after 14:00 hours. No snow transport was observed (even at ridgetop) after skies cleared at 14:00.

Snow surface

Lower elevations produced moist snow (approx 15 cm new). Upper elevations (above 1800) were blanketed in mid-density snow and pleasant skiing conditions.

Snowpack

We dug a series of snow pits at 2100 feet on a SW aspect at treeline on Tincan Common. Our pits were generally 150 cm in depth, and reached down to the interface of the NSF and Rain crust from the previous week. Our tests revealed generally good structure (the NSF was actually slightly harder then the storm snow above it), decent strength (save for many easy Q3 shears in the top 20 cm: corresponding to the human triggered shallow soft-slabs above us), and low energy.

Photos & Video
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