Observation: Summit

Location: Tenderfoot

Route & General Observations

Common uptrack to Tenderfoot ridge, high point around 2,600′.

With such poor light, we had no way to assess the natural avalanche activity that likely occurred in this area between Feb 18 and 20.

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

One whumpf felt at 2,400' near where pit was dug. Collapsing in faceted snow 2-3' deep was the likely culprit.

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

Obscured skies
Light snowfall (1" or so new from the day).
Calm (no wind)
Temps around 20-25F

Snow surface

6-10" of soft settled powder.
Appeared to be around 8-10" of new snow since Monday (Feb 17).
Very little wind effect in the new snow, but significant old wind effect underneath above the trees.


Very poor structure. A 2-3' foot slab sits over various layers of very weak faceted snow with degrading crusts intermixed. The slab is generally fist hard on the surface transitioning to 1 finger to 1 finger plus on the bottom. So, a relatively soft slab. Facet layers are 5 to 20cm thick and are fist hard to 4 finger.

Dug two pits close to each other and near location of collapse (whumpf)
Snow depth 165 to 185 (5-6'), West aspect, 2,400' elevation
ECTP 17, 22 and ECTX at the top of the facets 90cm down (3')
ECTP 15, ECTX x 2 at an old storm interface that was 50cm (20") down

Photos & Video
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