Bulletin d’avalanche

Jasper

Apr 16 – 17, 2018Parks Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Wed
Thu
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Current avalanche problems have been reactive to light loads recently - the hazard may increase quickly if forecast snowfall amounts are exceeded.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    New snow will bury windslabs in the Alpine and TL, these are overloaded and under tension, and remain sensitive to light loads.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–2.5
    Large cornices in all areas of the bulletin region. When failing these are triggering persistent instabilities and the subsequent avalanches are proving large and destructive.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    A slab up to 1m thick overlies: weak faceted crystals, and sun crusts (on steep S and W aspects). This problem has been reactive recently in North facing terrain.

Weather Forecast

Flurries continue for the next 24 hours.  Accumulations and loading may vary significantly.  Forecasted snow amounts are up to 7 cm in the Icefields area, with much less in the North.  Freezing levels will fall to valley bottom overnight and rise to 1800m mid-day. Ridge winds will be mainly light and variable, with gusts into the moderate range.

Snowpack Summary

Up to 20cm of snowfall since Thursday and moderate SW winds have built windslabs in open areas at treeline and in the alpine, and continue to add to the cornice problem. Persistent instabilities (down 40-100cm) remain sensitive to triggering, especially on N slopes at treeline and in the alpine. The mid and lower snowpack remain weak and facetted.

Avalanche Summary

No new avalanches reported today. Check Avalanche Canada's MIN Reports for several recent reports of large avalanches, both natural and skier triggered.

Confidence

Intensity of incoming weather systems is uncertain

Régions couvertes