Bulletin d’avalanche

Banff Yoho Kootenay

Nov 11 – 12, 2015Parks Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
Sans niveau
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Points saillants

Lots of keen climbers and skiers out there, but the snowpack is weak and skiing is marginal in all but high, glaciated terrain. People are triggering avalanches, and it looks like the first avalanche cycle of the winter on Friday and Saturday!

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Avalanches up to 50 cm deep are being triggered in many areas in high alpine, glaciated terrain. Watch out for windloaded features which should be avoided at this time as triggering is easy.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    The entire snowpack is unconsolidated, and loose avalanches have been observed to have run through confined gully areas - this is something ice climbers should keep in mind as they consider any overhead hazards to their routes.

Weather Forecast

Looks like a stormy week ahead, as a NW flow brings 10 cm of snow by mid-day on Wednesday while temperatures remain cool (-8 to -11). After a short break on Thursday, looks like a pumper of a storm for Friday with amounts up to 30 cm being predicted . . . alas, accompanied by significant warming. Expect an avalanche cycle on Friday up high.

Snowpack Summary

Total snowpack depths range from 35-45 cm at treeline across the forecast area with a 5mm layer of surface hoar on the surface. Approximately 25 cm of light snow overlies slightly stronger layer that sits on the ground. Two shears exist: one on the ground, and another down 15 cm from the top. Overall this snowpack is weak with little structure.

Avalanche Summary

Slabs and loose snow avalanches have been triggered and are running naturally from alpine features, up to about size 2.5. In confined areas, the debris has run down to treeline areas. Today at Bow Summit a size 1.5 avalanche was remotely triggered on the ground, 35m ride and ran 80 m. On the Wapta, a group remotely triggered a size 2 on Mt. Olive.

Confidence

Régions couvertes