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Avalanche Forecast

Archived

Nov 14th, 2025–Nov 15th, 2025

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.
Below Treeline
Below Threshold.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Below Threshold.

Regions

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

Friday brought cooling following Thursday's wet, warm storm.

With the high freezing levels, accumulations at treeline were modest. Expect a very different picture in the alpine.

While fresh slabs can be found in specific features at treeline, widespread and much more developed slabs exist in the alpine.

Confidence

Moderate

Avalanche Summary

Visibility was poor Thursday and human activity was limited.

A flight to Bow Hut Friday, again in poor visibility, found many slabs out in alpine lee fans 20-40cms thick that were likely triggered from above and that propagated 20-30m to sz 1.5. Lake Louise triggered 3 sz 1.5 slabs near ridge top averaging 15cm deep and saw a single natural slab low on the slopes of the National Geographics.

Sunshine had no results to ski cutting at treeline elevations.

Snowpack Summary

Up to 50mm of rain has been recorded in the past 36 hrs in Kootenay NP, with amounts around 20mm north of this. With freezing levels for the period near 2200m, only about 10-20cm of snow is expected to have accumulated at treeline elevations. In the alpine, more snow is expected to have arrived. Moderate to strong S-W winds have developed fresh wind slabs. Snow pack depths taper rapidly below 1800m. The wet snowpack at low elevations is in the process of re-freezing Friday.

Weather Summary

The winds are now out to the West and expected to continue in the moderate to strong range through Saturday. Temperatures at treeline will drop to -10C overnight Friday and a few cm of snow is possible into the morning hours as treeline temps recover to around -5C.

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.