Avalanche: Summit

Location: Road obs Summit Lake

Route & General Observations

Strong ridgetop winds and active wind loading caused natural avalanche activity throughout Summit Lake zone. I observed an avalanche in motion on the NW face of Moose Mountain. See photo series below. Winds were from a Southerly direction, but also shifted at times from the West, both unusual wind directions for this area. Northern aspects appeared to have the most wind loading during the 2 hours I was in this zone. There were natural avalanches on North, West, and South aspects throughout Summit.

Avalanche Details
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Trigger NaturalRemote Trigger0
Avalanche Type UnknownAspect Northwest
Elevation 3500ftSlope Angleunknown
Crown DepthunknownWidthunknown
Vertical Rununknown  
Avalanche Details

Witnessed one natural avalanche triggered by active wind loading on Moose Mnt.

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

Numerous natural avalanches (D2 - D3) on:
Moose Mnt (NW and SW aspects)
Twin (W)
Lonestar (W)
Butch (W)
Tri-Tip (W)

Active wind loading on all ridges - very large plumes

Weather & Snow Characteristics
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Southerly winds that shifted at time (40s' gusting 60mph)
4" new snow from overnight
Patches of sun

Photos & Video
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