Bulletin d’avalanche

Northwest Coastal

Jan 31 – Feb 1, 2012Avalanche Canada
Voir sur la carte
Archivé · expiré 15 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
Ouvrir la carte complète

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–6
    Widespread due to strong, shifting winds and large amounts of snow available for transport, but are generally lurking below ridgecrests, behind terrain features and in cross-loaded gullies. They can fail as very large, destructive avalanches.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–5
    Large storm slab avalanches have been occurring for the past week and are expected to remain sensitive to triggers for the forecast period.

Confidence

Fair - Due to limited field observations for the entire period

Weather Forecast

Wednesday: Flurries are expected in the morning increasing to heavy precipitation and strong southwestely in the evening. Freezing levels are expected to remain around 1200m. Thursday: Heavy precipitation with 50mm expected throughout the day. Extreme southerly winds and freezing levels as high as 1400m. Friday: Precipitation and wind should ease off with a clearing and cooling trend throughout the day.

Avalanche Summary

Warm temperatures and light to moderate precipitation resulted in several low-elevation natural storm slab avalanches up to Size 1.5 on Monday. Storm slabs continue to be reactive to natural and human triggers.

Snowpack Summary

Total snowpack depths are well above average for this time of year and it won't stop snowing! Recent warm temperatures and upside-down storms created a touchy surface slab. Other weaknesses within and under the 150+cm of recent storm snow create the potential for step-down avalanches, but things seem to be settling rapidly. Strong winds associated with recent storms means large weak wind slabs and cornices on lee and cross-loaded terrain. Most snowpack concerns are limited to the surface layers, however large triggers such as cornice falls and smaller avalanche stepping-down could reawaken deeper persistent weaknesses.

Régions couvertes