Bulletin d’avalanche

Banff Yoho Kootenay

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

Danger d’avalanche

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

A natural avalanche cycle occurred today due to the warm temperatures. We expect this to continue until things cool down. Until then avoid all avalanche terrain and minimize your exposure to large slopes when traveling at valley bottom.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    New wind slabs will continue to form in open areas above tree line with the strong W winds and warm temperatures. These will be prone to human triggering over the next few days.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–2
    Strong winds may keep snow surfaces cool at upper elevations, but lower elevations and thin rocky areas on solar aspects should be suspect and may trigger the weaker basal layers and subsequent larger avalanches.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    2–3
    In shallow snowpack areas (most of the region) the weak base of the snowpack persists and has been failing naturally in steep terrain. Although in some areas, the Dec. 18th layer persists, management of both layers should be the same.

Weather Forecast

Continued warm temperatures with freezing levels near ridge tops and strong to extreme W winds continue for Monday. On Tuesday things begin to cool off slightly and we may see some light precipitation. Wednesday the cooling trend continues with winds shifting to the North and generally clear skies.

Snowpack Summary

Strong to extreme SW winds creating wind slabs in open areas above tree line and intense wind transport at ridge tops. Moist snow to ridge top on solar aspects and on all aspects below tree line. Becoming isothermal in shallow low elevation snow pack areas. Dec 18th and basal facets failing naturally and producing avalanches up size 2.5 today.

Avalanche Summary

Numerous natural avalanches were observed and reported today with slabs up to size 2.5 at tree line and above and loose wet slides up to size 2 below tree line in all of the forecast region. Notably Cascade Falls, Rogans Gully, Bourgeau L & R and many of the climbs in Field all saw avalanche activity today. We expect this cycle to continue tomorrow

Confidence

Freezing levels are uncertain on Tuesday

Régions couvertes