Gunnison

Avalanche

Zach Guy · Dec 20, 2020 · Gunnison

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Weather

Weather: Moderate ridgetop winds. High clouds thinned through the day.

Snowpack

Snowpack: Rec skiing on southerly aspects to take a break from looking at persistent slabs. We had to manage for small windslabs that were easy to identify and avoid. Wind drifted slabs were 8” to 10” thick near treeline, easy to produce cracking on moderate slope angles. Above treeline, wind slabs were up to 18” thick and harder (1F) and more stubborn. These were all cracking on lower density snow from earlier in the week. We also got several rumbling collapses on lower angle terrain where buried sun crusts (2 feet deep) are thinner than on steep aspects. The basal structure transitions from a strong crust on steep south to a thinner, weaker, more collapsible crust on ESE. We avoided drifts and stayed on more southerly pitches with no avalanche activity.

Avalanche

Spotted a few more recent persistent slab avalanches fitting the usual pattern.