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Avalanche Forecast

Archived

Dec 5th, 2021–Dec 6th, 2021

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

Regions

Glacier.

Pockets of wind slab may be found in the Alpine.

Cold temps and short daylight hours, give yourself extra time to move through the hard crusty conditions at lower elevations.

Weather Forecast

Monday will see a mix of sun and cloud, isolated flurries with accumulations up to 2cm. Ridge top winds will be light from the South West and the freezing level will remain at valley bottom. Temps will be cool as the Alpine high may reach -13. Another pulse of snow arrives Tuesday evening and into Wednesday with ~20cm forecasted.

Snowpack Summary

At tree line and below, the Dec 1 crust is now buried by 5-25cm of snow. In the alpine, 20-40cm 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

Size 1.0 skier triggered soft slabs in steep, unsupported terrain where the new snow sits on the Dec 1 crust.

The Dec 1 storm produced widespread avalanches, both natural and artillery triggered, up to size 3.5, many reaching valley bottom. The frozen debris from these means travel in low elevation run-outs is rugged.

Confidence

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.