Bulletin d’avalanche

Northwest Inland

Dec 27 – 28, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Sat
Sun
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.

Avalanche Summary

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

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain

Weather Forecast

Friday: Light winds. Alpine temp around -6. Light snow.Saturday: Light to moderate NW winds. Freezing level at valley bottom. Very light snow, tapering off and partly clearing.Sunday: Moderate S winds. Freezing level at valley bottom. Light snow starting late in the day.

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 and some areas have no wind-effect at all. 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