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Avalanche Forecast

Archived

Dec 7th, 2021–Dec 8th, 2021

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

Stormy weather, strong winds, and new snow have increased the hazard to Considerable at higher elevations.

Weather Forecast

~15cm of new snow and strong SW winds are forecasted for Tuesday evening, with cool temperatures. Another 10cm is likely to fall throughout the day on Wednesday with similar strong winds and cool temperatures again. Continued light precipitation is forecasted for the remainder of the week.

Snowpack Summary

At tree line and below, the Dec 1 crust is buried by 10-40cm of snow. In the alpine, 35-50cm of snow has been redistributed by moderate Westerly winds and either lies on previous wind effect or icy bed surfaces from last weeks avalanche cycle. The mid and lower snowpack is rounded and well bonded. Travel conditions at lower elevations is rugged.

Avalanche Summary

No new avalanches were observed in the Highway Corridor, or reported from the Backcountry yesterday. Unreactive wind slabs were noted in a MIN report from Young's Peak, ~10cm deep with no propagation. On Sunday a field team skier triggered a size 1 soft slab in steep, unsupported terrain where the new snow sat on the Dec 1 crust.

Confidence

Due to the number of field observations

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.