Observation: Girdwood

Location: Girdwood Alpine

Route & General Observations

Traveled ridges to alpine. 4,200’.

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

Had two large whumphs initiated from firm snow on ridges.

The second whumph caused a crack 50’ from the skier on the ridge which extended 150’. The snow had been wind stiffened. The crack was on surprisingly low angle terrain estimated less than 30 degrees.

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

Temps around 20. Light to moderate north winds. Sunny to broken skies with increasing valley fog throughout the day.

Snow surface

4-6” of fluffy new.

Some areas scoured to crust.

Some areas of wind stiffened snow.


No formal test. Discernible crusts and facets below new snow.

Photos & Video
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