Observation: Turnagain

Location: West Face of Sunburst

Route & General Observations

We broke trail along the normal sunburst skin track heading towards the ridge with the intentions of gauging snowpack stability.

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)?Yes
Observer Comments

Large, reoccurring whumphing was observed accompanied by shooting cracks above 1500ft on open slopes. Largest whumph sounded like it propagated uphill hundreds of feet.

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

20201121 @ 13:30
Sky condition was broken
Winds were light from the NE
No precip during observation

Snow surface

Smooth new snow surface, stellar precipitation particles
Overnight snow accumulation between 20-40cm
Ski/Boot penetration: 26/60 cm


While touring significant whumphing was observed above 1500'. The primary layer of concern was initially thought to be the new/old snow interface but after a series of snow tests the LOC was found to be a layer of facets at ground level. Four out of five lemons were observed in the snowpack test.

- Less that 100cm snowpack
- Weak layer was identified
- Grain size difference >1mm: 4mm facets
- Weak layer < 10cm

Elev: 2400ft, Aspect: 300 degrees, Incline: 22 degrees
STM 40cm down at new/old interface
CTV 60cm down at snow/ground interface
ECTP 12 60cm down

Photos & Video
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