Avalanche: Douglas Island

Location: Twin C.

Route & General Observations

Observed widespread deep natural avalanche crowns throughout the watershed. Dug into the snow just below a crown line to test the reloaded snowpack on the bed surface that had slid. Then dug into the snow above the crown line to test the bed surface/weak layer that had avalanched. Got significant propagation saw tests both below and above the crown, on two different layers. Persistent weak layers remain present both in snow packs that have already released, and those that haven’t yet.

Avalanche Details
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Trigger NaturalAvalanche Type Soft Slab
Aspect NorthElevation 2400ft
Slope Angle 27degCrown Depth4ft
Width 125ftVertical Run 250ft
Avalanche Details

Many natural avalanche crowns, looked to be about the same depth, on all aspects N-E-S. Likely released in the last week of February. Next watershed over did not have any visible deep crowns yet. Perhaps they are waiting for more load...

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

Pretty much everything on steeper slopes near the top of the ridge we were on had slid deep. Also observed cracks that had been covered by recent snow but were still identifiable.

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

Overcast, cool, light S breeze. Intermittent and very light snowflakes just starting to fall before the storm front.

Snow surface

3-5mm surface hoar.


See snow profiles. Persistent weak layers are still out there! The slabs are just getting deeper. Consequences are increasing as the predictability of triggering decreases.

Photos & Video
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