Bulletin d’avalanche

Jasper

Dec 24 – 25, 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

Cold arctic air entrenched in area yet temperature inversion forming. -22 in valley and -8 at 1900m.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    Thursday's 10 cm and Sunday's 8cm of snow with little wind has buried the preexisting wind slabs. Winds have shifted from S to N yet remain in light range. Watch for reverse loading patterns from local terrain influences.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    2–4
    The strong mid-pack above this weakness is slowly loosing its strength. Shallow snow pack areas are potential trigger spots. Consequences would be severe if initiated.

Weather Forecast

Cold Arctic air remains entrenched for the next few days. No significant precipitation and sunny periods. Winds will feel like they are coming out of the N and E. Inversion setting up as its -22 in the valley and -9 at 1900m.

Snowpack Summary

20cm of snow Thursday's to Sunday in the Icefields area has buried previous wind slabs, tree line and above. The mid-pack remains generally supportive however it appears to be loosing strength particularly in shallow locations. An amazingly good snow pack for the Rockies in December.

Avalanche Summary

Friday's avalanche control work at the Icefields released several loose size 2 avalanches in thin steep snowpack areas below treeline. Natural avalanches have been limited to similar characteristics, steep, rocky, thin areas creating loose avalanches.

Confidence

The weather pattern is stable

Régions couvertes