Avalanche: Turnagain

Location: Tincan Trees

Route & General Observations

Northern Tincan Trees – up the down track and through the trees to 2050′ we go

Avalanche Details
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Trigger UnknownRemote Trigger Unknown
Avalanche Type UnknownAspect Unknown
ElevationunknownSlope Angleunknown
Crown DepthunknownWidthunknown
Vertical Rununknown  
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

Todd's Run had a very large-ish (D2.5 - 3) slab run in the past day, with the crown very similar to the slide just after New Years. On the way down, this avalanche pulled out a deep pocket on the low ridge that defines the skiers right of the bowl... see photos below.

One small snowmachine triggered slab today at alderline on Seattle Ridge, roughly across from Tincan.

Small recent dry loose natural avalanches on steeps of Seattle Ridge.

A likely small glide crack opening up across from Eddies on Seattle Ridge.

Occasional moderate snow transport along Seattle Ridge, from west to northwest winds

Despite lots of off skin track travel, no cracking or collapsing, and no recent avalanche activity observed on the south aspect of Eddies.

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

Broken skies in the AM, transitioning to few clouds by afternoon
32 degrees at the car, dropping slightly throughout the day
COLD light south to southwest wind (direction likely from terrain) at treeline

Snow surface

3" of new snow overnight, on top of a thin breakable melt freeze crust at the parking lot (1000') which disappeared by 1200'

Ski penetration of 8-10" except for wind affected locations near treeline, where ski pen was 4-6". Boot penetration of 2' at treeline.


See below for snow structure at a slightly wind scoured location at treeline on a NW aspect, where we were seeking a location to evaluate structure to the ground. While the Christmas crust, Thanksgiving crust, and 1/10 buried surface hoar (BSH) were all present, the two crusts were too deep for standard stability tests, and we had no results on the 1/10 BSH. The 1/10 BSH was surrounded by firmer snow, and wasn't upright in the pit wall... potentially not representative of non-winded slopes in the region.

Structure wise, a thin layer of .5 - 1mm facets are developing on top of the very impressive Christmas crust. Lower in the snowpack, the facets just below the top Thanksgiving Day melt freeze crust (down 160cm at this location) were also larger than they were last month, at 4 finger hardness and 1-2mm in size with very pronounced edges. The facets above the crust were the same size, but were one step harder... see photo below.

Photos & Video
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