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Observation: Turnagain

Location: Sharkfin Treeline

Date:
Observer:
Route & General Observations

Alaska Pacific University Snow Science 1 class field day.

Red Flags
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Observer Comments

Noticed several glide cracks at mid-elevation on the zone below Seattle Ridge weather station, but not sure how recently they have formed.

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

Clear skies, no new precipitation.
Temps 3F at 9:30am, but balmy 25F in the afternoon.
Calm to light winds, even at treeline.
All in all a beautiful sunny day in the mountains.

Snow surface

1-2cm surface hoar at lower elevation.
Near surface facets with mixed in tiny surface hoar at 1900'.
Variably sastrugi and wind crusts on W aspect.
Pesky suncrust on S aspect affected ski quality.

Snowpack

Dug on both N and S aspects on Sharkfin lower ridgeline. Here are the cliff notes:
North
HS:245cm
Buried surface hoar was intact at 80cm from top, but non-reactive. CTN, ECTX.
South
HS:155 cm
Several sun crusts at top 20cm, all of them had small facets underneath.
20cm of basal facets were pouring out in the pit, but it was not reactive and failed in ECT only after excessive force.

Photos & Video
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