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Observation: Summit

Location: Tenderfoot

Date:
Observer:
Route & General Observations

Standard skin track on W aspect of Tenderfoot to 2800′

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

Experienced several large collapses and localized cracking off of the established skin track
Blowing snow was seen several times on ridge tops loading West and South aspects.

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

Cloudy w patches of blue
32F at the road
5-15 mph NE winds
scattered snow flurries, little to no accumulation

Snow surface

settled snow - moist surface, easy to make into a snowball

Snowpack

Poor structure was found in all pits. Depths gradually increased from 20" to 30" with elevation. Below 2500' in area protected from winds (in the trees) the snow was upside down. Breaking trail was difficult as skis punched deep 15-20" below the surface in places. Hand pits and snow pits revealed a consistent layer of very weak snow on the ground (facets/depth hoar) and also found two layers of buried surface hoar in a pit at 2300'. In this pit we had an Extended Column fail with two taps from the wrist on two layers at the same time. A layer of buried surface hoar 15" (40cm) below the surface and depth hoar 27"(70cm) below the surface. We repeated the test and had a different layer of buried surface hoar fail with 7 taps from the wrist. See pit diagram below for details.

The largest and loudest whumpf was at 2500' in a protect area of the trees on a NE aspect. Dug a quick pit and very large surface hoar sitting on facets was the culprit. No tests were performed in this pit since layer had already collapsed. See photo below.

Above treeline snowpack is variable due to several wind events this winter. Depths varied from 1-3' between 2500' and 2800'. Weak faceted snow was found on top of an old melt/freeze crust near the ground with a hard wind slab and 14" of new settled snow on the surface. See pit diagram from 2800'.

Photos & Video
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