Observation: Turnagain

Location: Tincan - Todd's Run

Date:
Observer:
Route & General Observations

Todd’s Run via the standard Tincan uptrack

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

Solar aspects were feeling the sun today; many loose snow avalanches occurring on Seattle Ridge, some up to D2 in size.
Shallow skier triggered sluff in Todd's Run, running fairly slow
Small slabs, a glide release, and recent loose snow avalanches on Eddie's
(see photos below for each!)

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

Few clouds, calm winds, and HOT in the sun, but relatively cool in the shade.

Snow surface

Moist snow surface on all slightly solar aspects, at all elevations by afternoon.
Alpine northerly aspects had small surface hoar growing along the Tincan ridgeline.
An almost supportable crust was buried by 1-3" of recent snow on all solar aspects, and on tree shaded/northerly aspects to ~1800'.
Ski penetration of 4-6" throughout Todd's, with a soft snow surface over a progressively firmer base.
Tracks from days prior at the top of Todd's Run were just slightly filled in by recent winds at ridgeline.
Below 1500' by late afternoon: The crust noted above melted on steeper solar aspects, with 3-6" of wet snow on the surface, while shaded slopes remained breakable crusty.

Snowpack

See below for snow structure and pit results at 3000' on a 20 degree slope, SW aspect of Hippy Bowl. This pit was dug to specifically evaluate the new/old interface from 3/30 on an alpine solar aspect. See stability test results below, including non-propagating and rather stubborn compression test scores. The weak layer was 1cm above a preexisting stout melt freeze crust at this location, primarily composed of decomposing stellars - still quite preserved! - and small facets at the interface. A quick hand shear test on a northerly slope at 1700' also was stubborn to fail, but when it did fail, the failure plane was clean. At this location, just small facets were observed at the interface, directly on the crust.

Photos & Video
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