Bulletin d’avalanche

Northwest Coastal

Dec 15 – 16, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Mon
Tue
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–5
    Storm snow instabilities are possible on steeper slopes. New windslabs may have formed behind ridges & ribs, primarily on north and east facing terrain.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    3–7
    Deeply buried weaknesses exist, and the incoming storm could test their strength. Dropping cornices or smalller surface slides could step down.

Weather Forecast

Synopsis: The next Low pressure system is tracking south of the region so the NW is setting up for little precipitation, light wind, and continuted cool temperatures over the next few days.Sunday: Light to moderate SW wind with light & localized convective snow squalls and alpine temperatures around -8C and below freezing temperatures right to the valley.Monday & Tuesday: Light SW or W wind, light & localized snow flurries, continued cool temperatures with below zero at all elevations.

Avalanche Summary

Near Stewart only small loose slides from sttep cliffy terrain; otherwise no new naturals reported. Near the Shames backcountry evidence of a mid-week natural cycle of small (size 1 to 1.5) slabs was reported. No new recent reports from Terrace were received.

Snowpack Summary

The storm forecast for today (Saturday) didn't seem to make it onshore with any great punch, only light accumulations reported away from the coast. The upper snowpack should be mostly slowly settling powder with pockets of windslab or wind affected snow in exposed areas. Below this, near Shames at least, there may be some patchy surface hoar. Deeper in the snowpack professionals continue to monitor a crust down near the ground. It seems this problem is confined to  alpine areas and likely needs a large trigger and / or a shallow snow pack feature to trigger.

Régions couvertes