Avalanche forecast

Banff Yoho Kootenay

Dec 15 – 16, 2025Avalanche Canada
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Avalanche danger

Wed
Thu
Alpine
4 · High
Treeline
4 · High
Below
4 · High

Highlights

Continuous storms add load, keeping avalanche danger elevated. Avoid avalanche terrain.

Avalanche problems

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Very Likely
    Size
    2–3.5

    Warm temperatures, strong SW winds, and a fresh load of precipitation will only add to the touchy slab (sitting on top of the Nov 22 layer), which will become deeper, wider, and more destructive.

  • Loose Dry

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Very Likely
    Size
    1–2

    Continued wind and snowfall will keep dry loose avalanches ongoing above tree line. Below tree line, the same loose-snow problem could shift to wet loose avalanches due to rain.

  • Storm Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Very Likely
    Size
    1–2.5

    Warm temperatures and ongoing precipitation will build storm slabs, while strong SW winds actively redistribute snow into wind slabs in lee terrain at higher elevations.

Confidence

Moderate

Avalanche Summary

On a road patrol along Highway 93S, steep chutes on Mt. Wardle were observed to have cycled. Obscured visibility limited observations, and no additional avalanches were noted. Despite this, it is anticipated that an avalanche cycle is underway in response to the storm. Lake Louise triggered 2 healthy size 2.5s in previously unworked terrain. Sunshine triggered up to 10 size 2 persistent slabs running on the the Nov 13 layer.

Snowpack Summary

Strong SW winds and new snow continue to build thick slabs in the alpine. Warm air and rain to 1600 m are soaking last week’s storm snow (30–60 cm). A 60–100 cm slab now sits over the Nov 22 facet layer, which is particularly touchy where it is associated with a sun or temperature crust that persists in some alpine areas. Lower down, the Nov 13 rain crust extends up to roughly 2100–2300 m.

Weather Summary

We continue to get worked over by weather. Warm temperatures and rain will reach up to 1600m, with snow above, where temperatures drop to around -5 °C in the alpine. Expect around 10 cm today and up to 30 cm by Wednesday, with unrelenting strong SW winds through Monday and Tuesday.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.

Regions covered