Avalanche: Hatcher Pass

Location: Ray Wallace

Route & General Observations

Managing Sluff in Ray Wallace 3/18

Our group lapped Ray Wallace today. We triggered at least 10 slab avalanches. Also, lots of sloughing. These are discussed in the Avalanche Details section below. Our pit is discussed in the Snowpack Discussion.

Avalanche Details
If this is an avalanche observation, click yes below and fill in the form as best as you can. If people were involved, please provide details.
Trigger SkierRemote Trigger0
Avalanche Type Soft SlabAspect Northwest
Elevation 4500ftSlope Angle 40deg
Crown Depth 15inWidth 60ft
Vertical Run 600ft  
Avalanche Details

These slabs generally started in the storm snow, but some propagated through multiple layers. Generally, they were less than 30 feet across and did not run full length. One was at least 60 feet wide, was initiated at the top of the line, wrapped into two chutes, ran full length, and covered the skin track below the chutes. Slides initiated near the top of the face, but also midway down. Pictures of three different slab avalanches are attached. These were the kind of slides that are hazardous in terrain traps and extreme terrain.

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)?Yes
Observer Comments

Skier triggered avalanches.

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

Clear and calm.

Snow surface

6-9 inches of faceting storm snow.


HS: 250 cm
HP: 120 cm
Aspect: NNW
Elevation: 4,400'
Slope Angle: 40 degrees
CT12 Q2 25 cm down; CT14 Q2 45 cm down; CT16 Q3 60 cm down.
ECTN12 25 cm down; ECTN22 45 cm down.
Failure at 25 cm was at bottom of storm snow; failures at 45 cm and 60 cm were on facets between hard layers.

Photos & Video
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