Avalanche: Hatcher Pass

Location: Repose fan of Lost Couloir on Granite Mountain

Date:
Observer:
Avalanche Details
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Trigger NaturalAvalanche Type Soft Slab
Aspect WestElevation 4300ft
Slope Angle 30degCrown Depthunknown
Width 80ftVertical 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
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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.
Weather

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.

Snowpack

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

Photos & Video
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