Observation: Summit

Location: Summit, Birch Trees

Route & General Observations

Toured up to 1900′ on the Northeast shoulder of the “Birch Trees Run” or “Japan Trees” run with the AAS Pro 1 class to dig snow pits and observe snowpack. On the tour up we observed 1 collapse around 1500′ on the skin track.
We dug pits on an East facing meadow at 1950′ with variable results

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?No
Collapsing (Whumphing)?Yes
Cracking (Shooting cracks)?No
Observer Comments

Whumphing observed while skinning up around 1500'

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

Overcast around 11:40 am, S1, Light wind SW, smooth snow surface, -3C Air temp. New snow, 10"

Snow surface

Smooth, good ski quality. 55cm Boot pen, ski Pen 25cm.


Full pits @1950' East facing. 28deg
2 major layers of concern at Dec 1 crust with facets above layer, and basal facets at base of snowpack.
Test results: CTV SC on Base Basal Facets, ECTP22 on 12/1 layer, PST 44/100 END 20201201
Snowpack findings: Poor structure overall in snowpack, low strength, and moderate propagation.