Avalanche: Hatcher Pass

Location: Repose fan of Lost Couloir on Granite Mountain

Avalanche Details
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Trigger NaturalRemote Trigger0
Avalanche Type Soft SlabAspect West
Elevation 4300ftSlope Angle 30deg
Crown DepthunknownWidth 80ft
Vertical Run 400ft  
Avalanche Details

Soft slab naturally triggered slide that ran approximately 400 vertical feet down onto the repose fan for the Lost Couloir on Granite Mountain in the Gold Cord basin. Slide appeared to be triggered somewhere up into the throat of the couloir and ranout down to the toe of the repose fan. Classification: SS-N-S-U-R1-D2-S

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

Heavy snow overnight followed by high winds transporting new snow.

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

Heavy new snow overnight with 12+" accumulation with a SE wind to 10 MPH followed by clearing skies and a wind shift the the NW with gusts to 30+ MPH. Temps in the 20sF except during solar-noon where they got up new 32F.

Snow surface

Heavy new wind blown and drifted snow forming soft slabs.


Late season storm over deep existing snow pack with known persistent weak layers.

Photos & Video
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