Bulletin d’avalanche

Jasper

Feb 16 – 17, 2014Parks Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

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

Hazard expected to increase with up to 20cm expected for the Columbia Icefields Area by Sunday night.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Some pockets of wind slab exist in sheltered alpine features at ridge line. No natural activity was observed today but with more snow and strong SW winds we expect the hazard to increase through Saturday night and Sunday.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Recent slab formation overlies a persistent weak layer of surface hoar, facets and crusts found predominantly at treeline and below. This layer is going to become more reactive with the next pulse of snow which begins on Saturday night.

Weather Forecast

Moderate amounts of snow (10-15cm) in the Columbia Icefields tomorrow with more forecast into next week together with strong SW winds is going to increase the avalanche hazard.

Snowpack Summary

Recent snowfall overlies a layer of small surface hoar and surface facets. A relatively hard mid-pack is providing bridging strength over weak basal facets at tree line and above. Below tree line has a supportive (albeit shallow) mid-pack. Recent wind loading has produced touchy new slabs on Easterly terrain at treeline and above.

Avalanche Summary

Skier accidental at Marmot basin - size 1.5 on steep Easterly aspect below ridge top at 2100m. This slab was formed by recent loading of the new snow in the past 3 days and slid on the crust/facet interface down 40cm. No natural activity observed on road patrol between Jasper and Saskatchewan crossing.

Confidence

Intensity of incoming weather systems is uncertain on Sunday

Régions couvertes