Observation: Summit

Location: Road observation on drive to Tenderfoot for avalanche investigation

Route & General Observations

Driving through Turnagain there were a few small wind triggered avalanches that were not observed the day before. As soon as we made the turn to the west near Johnson pass we saw evidence of a more significant natural avalanche cycle on our way to and in the Summit Lake zone.

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

Natural avalanche activity

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

Northwesterly winds pluming snow throughout the day loading Southerly and easterly slopes in Summit.
Milepost 45 weather station was averaging 20 mph with gusts into the 30s. This station under reports winds. Winds were blowing from the South loading North slopes near Silvertip and Twin Peaks.
Temperatures recored in the single digits @ Milepost 45 wx station 3800'. Teens @ Summit Lake Snotel 1400'.
No new snow.

Snow surface

Wind scoured, satrugi

Photos & Video
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