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Avalanche Forecast

Archived

Nov 27th, 2019–Nov 28th, 2019

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

Regions

Banff Yoho Kootenay.

The main avalanche concern continues to be the lingering wind slabs. The most inviting slopes to ski may be those harboring this problem. Ice climbers may find it on approach or between pitches.

Weather Forecast

A predominant North East flow has moved into the forecast region. Mountain top winds forecasted to be moderate to strong from the EAST overnight, & ease through Thursday.

Thursday temperatures are marginally warmer (-20 to -13 range), isolated light flurries along the Eastern part of the region,

Friday - temps warm a bit as we head into the weekend.

Snowpack Summary

Widespread wind effect in the alpine. Some concern remains for possibly triggering old wind slabs from the strong SW winds on specific lee features. The Nov 8 crust is down 20-30 cm and present up to ~2400 m. The lower snowpack is a mix of weak facets & crusts. Snowpack depths at treeline vary from 60-90 cm with up to 140 cm in lee areas.

Avalanche Summary

Although the wind slabs from last weekend have become less reactive, ski cuts and explosive work on Tuesday triggered slabs up to size 1.5, 20-30 cm thick. No new natural avalanches in past few days.

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.