Bulletin d’avalanche

Jasper

Dec 14 – 15, 2012Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Although the avalanche hazard is Moderate, now is not the time to jump into the big lines.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    Pockets of wind slabs that vary in hardness are present on all open lee slopes.  No new avalanches have been observed and field tests show that these slabs have bonded well in most locations.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    Large loads such as slab avalanches and large cornice failures have triggered this weakness on SE to NE aspects in the alpine.

Weather Forecast

Light snow and light NW winds can be expected on Friday.  Expect seasonal temperatures.

Snowpack Summary

There is great variation in depth and location of the wind slabs that continues to build and harden from continued moderate to strong SW winds.  Theses slabs have bonded well.  In windswept areas in the alpine and at tree line, the November rain crust has been exposed along with dirt and rocks.  Cornices are well developed.

Avalanche Summary

No new avalanches have been observed or reported since the end the cycle that ended on Monday.  In that cycle, slab avalanches to size 3 were observed on NE aspects at alpine and tree line elevations, several stepped down to the basal facet layer.  Large cornice failure triggered large avalanches on the basal facet layer as well.

Confidence

Due to the number and quality of field observations

Régions couvertes