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Avalanche Forecast

Archived

Nov 15th, 2025–Nov 16th, 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.

Watch for wind slabs in lee alpine areas. These slabs are likely smaller in size but can have significant consequences for climbers and skiers in very steep terrain. The snowpack has a supportive crust below 2300m, but is thin with many early-season hazards.

Confidence

Moderate

Avalanche Summary

There were some explosive-triggered avalanches at Lake Louise ski hill today. They were up to 50cm deep and to size 1.5 in alpine lees. There was evidence of natural avalanches during the Nov 13 storm to size 1.5, but activity has tapered.

Snowpack Summary

0-5cm fell overnight, and 15-20+cm fell at treeline and above on Nov 13. Previous moderate-to-strong S-W winds have developed alpine wind slabs. Snow pack depths taper rapidly below 1800m. Expect a supportive rain crust below 2200-2300m.

Weather Summary

Mild temperatures will continue over the next few days with valley bottom temperatures going above freezing, and alpine temperatures staying around -5C. Light to Moderate SW winds, and zero to trace amounts of snow.

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.