Bulletin d’avalanche

Banff Yoho Kootenay

Mar 13 – 14, 2018Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Great spring like conditions exist right now with powder on polar aspects and crust on solar. The danger is Low/Low/Low in the morning and deteriorating with daytime warming. Get up early and enjoy the great conditions!

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Hot weather means cornice season, and this is the time when large mature cornices begin to fall off and the mountain sheds its snowpack. On ridges stay well away from cornices (they can reach back and get you), and avoid traveling under them.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–2
    The sun is strong right now and with this clear weather, it is destabilizing the snow on solar aspects in the afternoon. Generally these avalanches are running as loose wet and not stepping down to deeper layers, but the possibility remains.

Weather Forecast

Wednesday will start with a cold morning (overnight low of -10) but will warm up to reach +5 to +10 again in the afternoon with light south winds. Thursday and Friday look to be overcast with light snow (5 cm) and freezing levels staying below 2000m. Winds will remain generally light.

Snowpack Summary

North aspect snow is soft, cold and well settled with few weak layers of concern. South and west aspects now have a suncrust on the surface that becomes moist by 11am. Currently we are moving from Low danger in the morning to Considerable danger in the afternoon on solar aspects - so get an early start.

Avalanche Summary

Wet loose avalanches up to size 2 were running by noon on Tuesday on sun exposed slopes. These were less active on Tuesday than the day before, but will be most active on steep, thin, rocky solar aspects.

Confidence

Due to the number of field observations

Régions couvertes