Bulletin d’avalanche

Northwest Inland

Dec 25 – 26, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Thu
Fri
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 - Timing, track, or intensity of incoming weather is uncertain on Thursday

Weather Forecast

Wednesday: Light SW winds. Alpine temp -8. A few cm snow.Thursday: Light SW winds. Alpine temp -7. Light snow.Friday: Moderate to strong SW winds. Alpine temp around -5. Light snow.

Avalanche Summary

A size 2 glide slab released on an east aspect during the weekend. No other recent avalanches have been reported.

Snowpack Summary

A shallow snowpack (about 1m deep) exists, with facets continuing to develop while arctic cold air prevails. 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. Below treeline, very loose cold snow is sluffing easily from steep terrain. 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