Detailed Observation

ObserverGareth Brown

General Observations

1/11: Allison Creek up to 2000', NW aspect, 5° F at the road to 0° F at 2000', light wind, no snow transport.   Large collapses experienced that propagated up to 100 meters, Shooting cracks that radiated up to 30' long through pencil hard wind slabs, No new avalanches.  Observed an old avalanche with unknown trigger, R2-D2- ~150M wide.

Snow surface consisted of a variety of wind affected surfaces.  These ranged from snow scoured down to 12/29 rain crust, to wind slab that was 1 finger to pencil + hard, 6-24 inches deep.  The wind slab in this location still showed energy to create avalanches.

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Weather Observations

Observed Avalanche Activity