Avalanche: Summit

Location: Summit

Route & General Observations

5-8cm new snow (+) over windslabs (/)
From road valley fog & storm crust quickly dissipated by 1400′, sunny & mild; HS 90cm, 12/1 crust 35cm down;
1850-2350′ large collapses up to 50′ radii, dug down cracks, failing at bottom of wind transported snow, HS 115-130cm
12/1 crust 40cm down from surface; no collapses felt above 2350′
HS variable above nature’s tree line (5-170cm+), windward side in alpine virtually stripped to ground in places,
see photo @ 2700′
Despite dusting of + could see wind pattern across valley

Avalanche Details
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Trigger NaturalRemote Trigger Unknown
Avalanche Type UnknownAspect East
Elevation 3400ftSlope Angleunknown
Crown DepthunknownWidthunknown
Vertical Rununknown  
Avalanche Details

isolated minor loose in gullies mostly obscured by new snow

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

recent Wx, wind texture, stripping & loading patterns, pretty loud collapses

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

25*F, valley fog to 1450'; wind 0-2 mph becoming 5-10 @ 12h & increased elevation, moving snow @ 3000' and above for 90 minutes then becoming calm. Clouds to SSE did not push in by 1620h

Snow surface

5-8cm new over windslabs of varying thickness


resistant at 12/1 crust & moderate to hard in hand shears above that
12/1 crust has less bonded crystals between 2 more frozen layers
see Snowpilot

Photos & Video
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