Bulletin d’avalanche

Banff Yoho Kootenay

Dec 21 – 22, 2019Parks Canada
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Archivé · expiré 7 years ago

Danger d’avalanche

Sun
Mon
Alpin
4 · Fort
Limite forestière
4 · Fort
Sous la limite
4 · Fort
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Points saillants

An excellent day to check out the local ski area.

Avoid overhead hazard and avalanche terrain.

Problèmes avalancheux

  • Loose Dry

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

    As the snow accumulates, expect sluffing and point releases from steep, rocky terrain and gullies.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–3

    A touchy storm slab is forming and will become more sensitive to human triggering as the storm continues on Saturday.

  • Deep Persistent Slabs

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

    The weak, faceted mid and lower pack is being stressed by the new storm snow and might be reaching threshold. Lots of uncertainty surrounds this layer, but if triggered it would result in a large avalanche.

Weather Forecast

The infamous atmospheric river did not disappoint today and the storm continues on through Saturday night with another 30-40cm forecasted. Temps will remain mild on Saturday with an alpine high of -4 and a freezing level up to 1500m. Winds will be moderate, gusting to strong from the S-SW. Clearing trend on Sunday with cooler temps and light winds.

Snowpack Summary

20-35cm of storm snow in the past 24hrs accompanied by moderate Southerly winds is forming a storm slab in the alpine and at tree line. Below the new snow the snowpack structure is generally weak, consisting of facets and depth hoar. The Nov crust is present up to 2500m and ~30 cm up from ground. Snowpack depths at treeline range from 90-160 cm.

Avalanche Summary

Poor visibility has obscured any avalanche observations, but a natural avalanche cycle is either happening or about to happen. Avoid avalanche terrain.

Confidence

Intensity of incoming weather systems is uncertain on Saturday

Régions couvertes