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Observation: Turnagain

Location: Tincan

Date:
Observer:
Route & General Observations

Ascended to 2800′ on Tincan and skied the trees. ~4 inches of new snow. Active wind loading of Hippy Bowl in afternoon. Found propagation potential on intact Jan. 21 buried surface hoar (BSH) and facets under a 1 ft pencil hard slab in Common Bowl.

Red Flags
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Observer Comments

Wind loading in Hippy Bowl in afternoon.

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

Snowing ~1 cm an hour on average until 2 pm when the clouds cleared. The skies cleared with low valley fog in the afternoon.
30s F at valley bottom and 20s at ridgetops
Calm wind below treeline, light wind above treeline, moderate Northerly wind gusts at ridgetops

Snow surface

3-4 inches of low density snow. The snow did not appear to be bonding that well with easy failures on shovel tilt test.

Snowpack

Below 2100' hand pits failed easily or on isolation on fist hard facets over a decomposing melt freeze crust (MFC) 1.5' to 2' down. The Jan. 21 BSH was present but not failing in hand pits.

Above 2100' tests showed the intact Jan. 21 BSH were reactive, exhibiting propagation potential in Common Bowl under an old pencil hard wind slab. The Jan. 21 BSH lies around a foot down in the snowpack. We did find 1F facets growing around a decomposing 1" melt freeze crust ~1.5' down, but were not getting any failures on this layer.

Noticed a 1" sun crust under the new snow at 1600' on a steep, SW aspect.

Photos & Video
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