Valanga

Red Mountain

Aidan CrawfordSnoqualmie Pass
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Foto dell’osservazione 1Foto dell’osservazione 2

Quick report

During our morning ascent of SW Red Mountain we saw minimal to no signs of instability. From hand shears we observed that new snow from the recent storm had bonded well with the existing snow. However the snow had a high moisture content and the precipitation was adding more moisture to the surface snow. At noon the sun came out and woke up the snowpack very fast. We heard a slide go off on Lundin (presumed natural) and then ski-triggered a wet loose D1. We also observed multiple smaller wet loose slides as we continued to descend. We saw no evidence of wind transport on SW aspects up to 5800ft. All around a good day skiing and managing complex spring conditions in the mountains!

Avalanche

Descending SW Face of Red Mountain (~5500ft) we triggered a D1 Wet Loose avalanche on a 40 degree slope. We also heard avalanches running in the Lundin area around the same time (12:00pm). The snowpack became significantly more reactive after a brief (~15 min) period of sun combined with progressively wetter precipitation. Wet Loose snow was failing and entraining at the old snow / new snow interface.