Bulletin d’avalanche

Jasper

Dec 17 – 18, 2012Parks Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Mon
Tue
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    Pockets of wind slabs that vary in hardness are present on all open lee slopes. No new avalanches have been observed  in the last week, and field tests show that these slabs have bonded well in most locations.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    The November raincrusts are deteriorating into a facet layer that is not responding to field tests at this time. 

Weather Forecast

A frontal system is expected to come through on Monday with a slight rise in temperatures and only limited snow flurries. Ridgetop winds will increase to moderate/strong starting from the South and shifting to the West by late afternoon. Tuesday will have sunny periods with cooler temperatures.

Snowpack Summary

There is great variation in depth and location of the wind slabs. These slabs appear to have bonded well to the old snow surface, with no new avalanches observed in the last week. Cornices are well developed. The raincrust laminate down in the lower 1/3 of snowpack is deteriorating into a facetted layer and did not respond to field tests. 

Avalanche Summary

No new avalanches have been observed since Monday Dec 10.  Wind slabs appear to have bonded well to the old snow surface.

Confidence

Régions couvertes