Observation: Summit

Location: Japanese Trees

Route & General Observations

The APU Snow Science II class traveled to Japanese Trees in search of a reactive layer. The students toured up to 1600 where multiple snow profiles and tests were completed. The students then toured up to ~2500 and skied down before entering the alpine. The ski conditions were nice and continued to improve as we got further down.

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

Several glide cracks noted on the drive the new releases include a large glide on west face of Sunburst and the east face of Fresno

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

Temperatures in the teens and twenties, and calm to light wind. There was no precipitation for the majority of the day with a brief moment of trace amounts of snow. The wind began to entrain snow at around ~2200’.

Snow surface

Great skiing and riding conditions. Boot penetration of 18cm with a layer of surface hoar ontop of the light snow. Even isolated pockets of 10mm surface hoar in the trees. Around ~2200 the snow started to get some wind effect.


Japanese Trees: @1580’/ E aspect/ 18° slope angle-HS 115/ @10:40
Layer of concern BSH 40cm down with an average size of 2mm
CT22 SC 40cm down 40cm down
ECTN24 40CM down

Japanese Trees: @1600’/ E aspect/ 15° slope angle-HS 116/ @10:40
Layer of concern 4F Facets 69cm down ontop of the thanksgiving crust
PST 41/100 END 69cm down
ECTP 27 69cm down

Out of 6 pits in total in the near vicinity of the previous location there were 3X ECTX results

Japanese Trees: @2300’/ E aspect/ HS 110/ @13:00
BSH 10cm down easy hand sheer

Photos & Video
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