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Avalanche Forecast

Archived

Nov 21st, 2025–Nov 22nd, 2025

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
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.

Look for new reactive wind slabs in the alpine on Saturday from recent and ongoing strong winds.

Thanks to everyone for the great MIN posts and photos - very helpful!

Confidence

Moderate

Avalanche Summary

No new natural avalanches observed on road patrol up HWY 93 N, but the light was poor. No avalanches reported on Friday.

Snowpack Summary

Observations suggest a generally well-settled Rockies snowpack with no significant weak layers. Last week’s warm, wet weather produced a Nov 13 rain crust up to 2300 m. In the short term, this crust adds stability. 5–15 cm of dry snow lies at treeline, and has been subject to moderate to strong S-W winds in the alpine. Overall, early-season travel conditions are good, with treeline snow depths of 40–70 cm.

Weather Summary

Strong SW winds (40-50 km/h in the alpine) will continue through the weekend and ease Sunday night as the direction turns to a Northerly flow, Very light flurries through Saturday/Sunday, with greater amounts (10 cm) forecasted for Sunday night as the cool air moves in. Weekend treeline temperatures stay around -4 °C.

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

Terrain and Travel Advice

  • Wind slabs are most reactive during their formation.
  • 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.