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Avalanche Forecast

Archived

Nov 13th, 2025–Nov 13th, 2025

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

Regions

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

The forecasted storm has arrived early and consequently, we expect the hazard to increase on Thursday

Confidence

Moderate

Avalanche Summary

No avalanches were observed or reported on Wednesday.

Snowpack Summary

Last weeks storm snow (~20cm) has settled. Recent warm temps have produced surface crusts at lower elevations (~2100m). Small wind slabs still exist in alpine lee and gully features due to recent strong wind. Height of snow is 80-100cm in the alpine, 30–60 cm at treeline, and it tapers quickly below treeline. Early reports suggest that while the snowpack is generally thin, it supports the weight of a skier.

Weather Summary

Model guidance remains variable, but a storm parcel is expected to bring 10 to 35 cm of snow from Thursday into Friday, with higher amounts generally toward the northwest (Bow Summit) and lower totals to the southeast (Sunshine). Temps will stay warm through the event before dropping once precipitation ends. Winds will remain strong from the southwest throughout the period, prime conditions for slab formation.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.