Bulletin d’avalanche

Banff Yoho Kootenay

Jan 24 – 25, 2019Parks Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Thin areas will be the most susceptible to triggering the weaker basal facets/ depth hoar.  This problem is now hard to predict, and comes down to your level of comfort with the uncertainty combined with the type of terrain you choose.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–1.5
    Thin wind slabs are stubborn but still show potential for triggering in the alpine.  Increased winds on Thursday may add to their development.  These will not be a long term problem. 

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–3
    The weak Oct.26 facets and depth hoar at the base of the snowpack have a significant slab (50-130cm thick) sitting above them. The likelihood of triggering this layer has decreased, but if it does get triggered, the avalanche will be large in size.

Weather Forecast

Continued mild temperatures for January with highs in the -2 to -4C range at valley bottom and -8 to -10C at 3000m with West winds increasing to strong in the alpine.  Only a few cm of snow is expected over the next 2 days. 

Snowpack Summary

10-20cm of snow over the last few days. Thin wind slabs can be found in alpine lee areas from strong SW winds on Saturday. Of greatest concern are the weak facets and depth hoar at the base of the snowpack. In thinner snowpack areas with less than 150 cm of snow, triggering a slab on these facets is more likely.

Avalanche Summary

No new avalanches reported or observed.

Confidence

Due to the number and quality of field observations

Régions couvertes