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Avalanche: Hatcher Pass

Location: Upper Gold Cord Basin, SW of Birthday Pass

Date:
Observer:
Avalanche Details
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Trigger NaturalAvalanche Type Hard Slab
Aspect South SoutheastElevation 4400ft
Slope Angle 35degCrown Depth10ft
Width 700ftVertical Run 1000ft
Avalanche Details

Hard slab naturally triggered slide that ran approximately 300 vertical feet and subsequently appears to have triggered a soft slab/loose snow avalanche with runout that ran another 300 vertical feet down to and over a terrain trap then down a low angle gully to the nearly level valley floor. Other smaller "composite" avalanches were observed in the basin as well. The bed surface of the hard slab avalanche was very smooth and did not go all the way to the ground. Classification: HS->SS-N-S-U-D3-D2.5/D3-O

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 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 layer.

Photos & Video
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