Bulletin d’avalanche

Banff Yoho Kootenay

Mar 26 – 27, 2015Parks Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Sat
Sun
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
3 · Marqué
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Points saillants

Pay attention to the freezing levels. Some forecasts have freezing levels going up to 2600 m on Friday.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    There is generally 10-20 cm available for transport and moderate to strong SW wind continues to build windslabs. They are sensitive to human triggering on features such as ridge crests, cross loaded gullies, and steep lee terrain features.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    Rising freezing levels on Friday has the potential to create a loose wet avalanche problem on solar aspects

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    2–3
    The lower half of the snowpack is weak due to the presence of basal facets and depth hoar. This layer has been dormant lately but may become more sensitive with the rising temperatures.

Weather Forecast

Freezing Levels forecasted to rise to 2500m on Friday with a cooling trend starting on Saturday. Friday will be mainly cloudy with some scattered flurries moving in on the weekend.

Snowpack Summary

20-30 cm of recent storm snow at upper elevations is starting to form soft wind slabs on lee terrain in the alpine. These wind slabs overlay a variety of hard surfaces particulary on south aspects. Moist surface snow on south aspects up to ridge line. In most places the base of the snowpack is made up of weak facets and depth hoar.

Avalanche Summary

One skier triggered size 1.5 wind slab reported from a SE aspect at 2700 m in Bow Summit area.

Confidence

Freezing levels are uncertain on Friday

Régions couvertes