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Avalanche Forecast

Archived

Dec 12th, 2021–Dec 13th, 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 possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

Heads up for stiff wind slabs and variable skiing.

Extreme southerlies have changed the landscape in the alpine and exposed treeline.

Weather Forecast

An area of low pressure off the coast will bring flurries to Rogers Pass Monday and Tuesday.

Tonight: Trace of snow. Winds S - 25km/h. Freezing levels dropping to valley bottom.

Monday: 4cm. Winds SE - 25-45km/h. Freezing level 900m

Tuesday: 8cm. Winds SE - 30-45km/h. Freezing level 1200m.

Check out the Mountain Weather Forecast for more details.

Snowpack Summary

35cm of low density snow in the past 2 days, totaling 85cm of storm snow this week. Extreme south winds created fresh slabs in exposed terrain features, further down into the path than you might expect. The Dec 1 crust is ~15cm thick at 1900m, buried by ~90cm and found up to 2300m. The mid and lower snowpack is generally well bonded and strong.

Avalanche Summary

No new avalanches were observed today, however the blowing snow made for poor visibility

A natural avalanche cycle up to size 3 occurred Saturday with the new snow and strong winds.  Cheops N1 ran size 2.0 and dusted the skin track in the Connaught Drainage.

Many reports of size 1-2 skier triggered slab avalanches in steep terrain and on convex rolls

Confidence

Timing, track, or intensity of incoming weather system is uncertain

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.