Bulletin d’avalanche

Northwest Inland

Dec 29 – 30, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

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

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    Watch for wind slabs behind ridges and terrain breaks. These could be triggered by the weight of a person or snowmobile.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–5
    A deeply buried facet/crust weakness exists near the base of the snowpack. This layer could be triggered by large loads such as a cornice collapse or from a thin-spot trigger point.

Confidence

Fair - Due to limited field observations

Weather Forecast

Saturday night and Sunday: An upper ridge remains over the coast bringing dry conditions and light W winds until a front reaches the coast in the evening Sunday. Monday: Only traces of precipitations associated with the weak front are expected to reach inland and winds should be felt moderate to strong from the Southwest. Freezing levels are expected to remain at the surface but temperatures to warm up slightly with the arrival of the front. Tuesday: Temperatures around -4 C, no precipitation, light SE winds.

Avalanche Summary

No recent avalanches have been reported.

Snowpack Summary

A few cm fell since yesterday with relatively light winds from the NW.  As a general overview, a shallow snowpack (about 1m deep) exists, with facets that have continued to develop with this week's cool arctic air. Strong winds have scoured some SE aspects in the alpine to ground. Wind slabs exist in many wind-exposed areas, however their distribution is quite variable and some areas have no wind-effect at all. Below treeline, very loose cold snow is sluffing easily from steep terrain and early season hazards like exposed stumps are still to watch for. Professionals are still mindful of a facet/crust layer near the base of the snowpack. Although triggering it has become unlikely, it may be possible from a thin-spot trigger point or with a very heavy load (e.g. cornice fall).

Régions couvertes