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Avalanche Forecast

Archived

Nov 18th, 2025–Nov 19th, 2025

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

Regions

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

Convective snowfall on Tuesday has deposited variable snow across the region from a few cms in most areas up to 15cm. Generally light winds and warm temps have settled most recent instabilities but concern for small windslabs in steep alpine terrain still exists.

Confidence

Moderate

Avalanche Summary

No new avalanches observed or reported on Tuesday

Snowpack Summary

Limited early-season observations indicate a generally well-settled Rockies snowpack with no significant weak layers. Last week's wet snow and rain left a rain crust (Nov 13) to 2300 m. In the short term, this adds stability to the snowpack and with 5-10 cm of dry snow on top, only isolated windslabs have been reported along with good early-season travel conditions. Treeline snow depths range from 40-70 cm.

Weather Summary

A small system is passing through the region Tuesday night and is bringing variable snow amounts from 1-15 cm with light winds. Wednesday and Thursday will be sunny and calm with winds picking up throughout the day Thursday. Friday will bring strong to extreme SW winds and the next pulse of snow.

Terrain and Travel Advice

  • Wind slabs are isolated, but may remain reactive.

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.