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Avalanche Forecast

Archived

Nov 17th, 2021–Nov 18th, 2021

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, 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

Banff Yoho Kootenay.

Natural avalanches were still observed in past 36 hours. Conservative decision making is still required.

Weather Forecast

Mixed sun and cloud for Thursday with light snow beginning on Thursday night. Valley bottom highs of around -4 and ridge-top highs of -12 forecast for Thursday.

Snowpack Summary

Several cm of fresh snow exist over a surface crust (below 2100m). Recent storm snow (5 day total of 65-90 cm) is starting to settle. A melt/freeze crust exists near the ground (in some locations). Wind slabs and residual storm slabs exist in alpine and down into tree-line elevations. Snowpack depths at tree-line average 60-110 cm.a

Avalanche Summary

The natural avalanche from the recent storm has tapered however Lake Louise Ski Resort is still reporting explosive triggered and natural avalanches on Wednesday. These are primarily windslabs up to size 2 in the alpine, however one natural size 3 was also observed.

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.

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.