Bulletin d’avalanche

Sea To Sky

Mar 10 – 11, 2016Avalanche Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Sat
Sun
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Extreme winds on Thursday and ongoing wind-loading on Friday will keep danger high in the alpine. Give all this new snow a couple days to settle before pushing out to bigger more committing terrain.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–5
    Cornices are reported to be massive and weak. These could pop off at any time, but are more likely to fail with continued growth or during brief sunny breaks.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    2–5
    Triggering deep fresh storm slabs remains a concern on Friday. Winds are also forecast to remain fairly strong resulting in further wind loading on northerly aspects, and the potential for natural releases.

Confidence

Moderate

Weather Forecast

FRIDAY: Cloudy with a chance of sunny breaks followed by light snow 5-10 cm. The freezing level is around 1200-1400 m and winds are moderate from the south. SATURDAY: Periods of snow 20-30 cm. The freezing level is around 1200 m and winds are moderate gusting strong from the SE-SW. SUNDAY: Mainly cloudy with flurries. The freezing level hovers around 1200 m and winds ease to light.

Avalanche Summary

A widespread and large natural avalanche cycle probably occurred overnight Wednesday and on Thursday in response to rapid loading from snow and wind. All this new snow may take a couple days to settle and strengthen. Rider triggering remains likely on Friday, particularly in steep wind-loaded terrain.

Snowpack Summary

By Friday morning many areas could see as much as 100 cm of new snow on the ground. Weaknesses within or at the base of the new storm snow may need a couple days to settle and strengthen. Extreme southerly winds have created very deep and dense slabs in lee terrain, probably well below ridge crests, while scouring windward slopes. Ongoing stormy weather has also encouraged extensive cornice growth. The mid and lower snowpack are strong and well-settled.

Régions couvertes