Bulletin d’avalanche

Northwest Inland

Dec 9 – 10, 2015Avalanche Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Fri
Sat
Alpin
Sans niveau
Limite forestière
Sans niveau
Sous la limite
Sans niveau
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Points saillants

The places you are going to find the best riding conditions in the wake of the storm are probably the same places where the danger from a layer of buried surface hoar is greatest.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–5
    The new snow sitting on a buried layer of surface hoar may be reaching a critical depth for avalanches.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    2–5
    Weaknesses are lurking within and under the recent storm snow with particularly touchy slabs on the leeward side of ridge crests and on steep unsupported slopes.

Weather Forecast

THURSDAY: light snowfall, and moderate easterly winds, freezing levels at the valley floor. FRIDAY: flurries, light to moderate southerly winds, freezing levels at the valley floor. SATURDAY: There is some uncertainty in the forecast track of the storm that should hit the coast on Saturday. Some models have it coming in further north which could bring snow to the NW Inland others have it missing the region entirely.

Avalanche Summary

It sounds like there were touchy conditions out there over the weekend. Reports of some large skier triggered and skier controlled avalanches from tree-line suggest that the load on the recently buried surface hoar is probably at a critical level.

Confidence

Moderate - Due to the number and quality of field observations

Snowpack Summary

By my reckoning up to 60cm of new snow has fallen since the weekend with the area around Smithers receiving the greatest amounts. Unfortunately, heavy rain fell below 1500m and probably formed a rain crust that can be found just below the surface at lower elevations. At higher elevations the new snow sits on a layer of surface hoar, which has the potential for remote triggering, wide propagations and prolonged sensitivity to triggers. It has been reported lurking in most sheltered areas at tree-line and below, although I suspect that it may exist well into the alpine.

Régions couvertes