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Avalanche Forecast

Archived

Nov 28th, 2025–Nov 29th, 2025

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Banff Yoho Kootenay, Little Yoho, Banff, East Side 93N, Kootenay, Lake Louise, LLSA, Sunshine, West Side 93N, Field.

A crisp, cold weekend to finish November.

The storm snow that arrived last weekend is largely still in good shape following light winds most of the week but watch for isolated windslabs in steep alpine terrain.

Confidence

Moderate

Avalanche Summary

Sunshine's snow safety team reported a sz 1.5 slab above the Bourgeau Left ice climb which originated near ridge top but did not make it over the cliff late Thurdsay. Work in Delerium Dive produced several small wind slabs with the largest at sz 1.5 failing on basal facets in a thin area. Work in the South-side Chutes produced similar results to sz 1.5 however slabs were failing on a buried solar crust.

Snowpack Summary

A trace of new snow arrived Friday morning to sit atop the 20-40cm that fell last weekend. Variable winds have moved this snow to form isolated slabs in the alpine.

A thin sun crust / surface hoar interface sits immediately below the storm snow.

Slighlty deeper in the upper snowpack and below ~ 2300m a rain crust gains thickness with descent.

The mid and lower snowpack is generally well settled for this time of year with treeline total snow depths from 70-100cm.

Weather Summary

A ridge of high pressure is building over the area Friday and will hold through the weekend with mainly sunny skies.

Northwest winds will be light through Sunday before increasing late in the day as clouds arrive.

Treeline temperatures are forecast to stay near -15C overnight into Saturday before becoming steady near -12C through Sunday.

Click here for Environment Canada links to weather tables for the region.

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.