Bulletin d’avalanche

Banff Yoho Kootenay

Dec 26 – 27, 2025Avalanche Canada
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Archivé · expiré 9 months ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
1 · Faible
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Points saillants

Expect fresh windlabs in the alpine and down into tree-line. Forecasters are uncertain what the massive December snow load is doing on the deeper persistent layers. Conservative terrain choices at treeline and above are still required as we allow the snowpack to settle and adjust to this load.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2

    Moderate southerly winds have created fresh wind slabs in alpine and open treeline terrain.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–3.5

    The natural avalanche cycle on this layer has ended but skier triggering on this layer is still possible. Windslab avalanches could also trigger this layer, resulting in a large avalanche.

Confidence

Moderate

  • Uncertainty is due to the fact that deep persistent slabs are particularly difficult to forecast.

Avalanche Summary

Fresh windslabs up to size 1.5 have been reported and skicut in alpine and tree line terrain.

Snowpack Summary

15-30 cm storm snow in the last two days and moderate southerly winds have created fresh windslabs in alpine and open treeline terrain. Snowpack continues to settle. There is 30-60 cm settled over top of the Dec 15 melt freeze crust (which is present to ~1800 - 2000m) and the Nov facet/crust interface is down 80-140 cm. Treeline snow depths around 100-200 plus cm.

Weather Summary

Thursday night and Friday will bring light flurries with total accumulation by end of day on Friday between 10-15 cm. Winds will be SW in the Moderate range.

On Saturday the flow will shift to NW as an upper ridge builds over the area. Skies will clear, and temperatures will plummet.

Link to weather forecast

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Be mindful that deep instabilities are still present and have produced recent large avalanches.

Régions couvertes