Observation: Turnagain

Location: Tincan

Route & General Observations

Standard up-track to 2500′ on Tincan. The visibility improved throughout the day. We were able to see the evidence of the natural avalanche cycle from the storm and checked out where the sustained winds have moved the snow. The loading patterns including cornice growth, pillowed snow and small wind features throughout the terrain were accentuated again in this last event.

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

Active wind loading and evidence of wind slabs from yesterday's storm (D1-D2.5). Some larger debris piles from the paths off of Seattle Ridge. A few of those ran almost into the flats where sledders ride on storm days. This is a good reminder to remember what is above on those HIGH danger days. There was one wet slab (D2) that ran to the ground near the turn to Johnson Pass. We also observed a small wind slab on Petes South.

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

Broken trending to scattered skies
Winds were moderate and gusty, strong enough to move snow, decreasing in the afternoon
Temperature was 32F at the truck @1000', in the mid 20Fs @ Treeline 2500'
One very brief period of a few snowflakes falling

Snow surface

1000-1600': 1-3" of new snow over saturated snow.
1600-2500': 4-8" of new snow over progressively drier (as elevation was gained) snow beneath.


There was nothing of note in the snowpack. The new snow is bonding well to the surfaces below. There was no shearing in any hand pits, on test slopes or skin track cuts. No cracking or whumpfing or slab like conditions observed on the tour.
A quick pit at 2200' showed right side up storm snow bonded to the previous storm snow. Average HS in that area was 200cm. No results in stability tests.
Average snow depth at 1000' was 165 cm.

Photos & Video
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