Bollettino valanghe

Banff Yoho Kootenay

Dec 27 – 28, 2025Avalanche Canada
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Archiviato · scaduto 9 months ago

Pericolo valanghe

Mon
Tue
Alta quota
3 · Marcato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole

In sintesi

Enjoy the recent snow!

Continue to consider exposure to deep persistent avalanches, overhead and avoiding areas with wind slab in alpine terrain.

Avalanche control is planned for the Mt Bourgeau evening of Dec 26th, and Vermillion Peak and Mt Wymper Dec 27th. The closure zones for these areas will be in effect.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–2

    Moderate-strong southerly and westerly winds have created fresh wind slabs in alpine and open treeline terrain. Winds and transport on Dec 26th were reported more significant around HWY 93S, and less so around Lake Louise.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    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.
  • Uncertainty is due to the extreme variability of wind effect on the snowpack.

Avalanche Summary

A few natural avalanches up to size 1.5 from the last 48 hours were observed on a road patrol on the Sunshine road. No other new avalanches were observed or reported.

Snowpack Summary

20-50 cm storm snow in the last 72 hours and moderate southerly and westerly winds have created fresh windslabs in alpine and open treeline terrain. Snowpack continues to settle. There is 35-70 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 80-160 cm. Treeline snow depths around 100-200 plus cm.

Weather Summary

Tonight: Flurries. Accumulation: 11 cm. Alpine temps: Low -19 °C. Mostly light ridge wind occasionally gusting to 35 km/h.

Saturday: Sunny with cloudy periods and isolated flurries. Alpine temperature: High -17 °C. Ridge wind light to 20 km/h.

Sunday: Sunny with cloudy periods. Alpine temperature: Low -17 °C, High -10 °C. Possibly an alpine temperature inversion.

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.

Regioni coperte