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Avalanche Forecast

Archived

Jan 25th, 2022–Jan 26th, 2022

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

Natural avalanche activity has tapered off, but the deep instabilities within the snowpack are still present.

Shallow snowpack areas and unsupported slopes are trigger points to be avoided.

Weather Forecast

The forecast shows a quiet weather week, with calm in this stormy part of the world.

Tonight: cloudy, Alp low -10*C, mod SW winds

Wed: sun and cloud, Alp high -7*C, light NW ridgetop winds

Thurs: sun and cloud, Alp high -3*C, light SW winds

Fri: cloud, Alp high -4*C, mod SW winds

Snowpack Summary

Wind-affect can be found at treeline and above, varying from soft to hard slab, and recognized by a striated/rippled surface. The Jan 20th (2-4mm) surface hoar sits 30-35cm down, while the Jan 11 (2-5mm) surface hoar is down ~70-90cm. The Dec 1 crust/facet combo is down ~1.5 - 2.5m and will require a large trigger to come alive.

Avalanche Summary

No new avalanches observed in the highway corridor nor in the Sir Donald/Avalanche Crest area on Tuesday, Jan 25. A field team in the Sir D/Avalanche Crest zone ski-cut small features to 40* with no results.

Control work on Sunday produced results up to sz 3, one of which stepped down to the Dec 1st layer.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.