Bulletin d’avalanche

Northwest Inland

Mar 4 – 5, 2012Avalanche Canada
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Archivé · expiré 15 years ago

Danger d’avalanche

Tue
Wed
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–4
    New snow and strong westerly winds are developing thin new windslabs in the alpine and at treeline. Windslabs may fail naturally or be easily triggered with light additional loads.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    3–6
    The persistent weak layer continues to be buried by a few cm each day. Avalanches on this layer have not been reported for a few days, but we feel that it could still be easily triggered by skiers and riders.

Snowpack Summary

Moderate southwest winds transported the 3-5 cm of new snow that we have received over the past two days into thin new windslabs at ridgetops. Currently, up to 60cm of snow sits over the mid February interface. This interface is variable, it consists of a strong melt freeze crust below 1000m, above 1000 m exists facets, surface hoar (in more sheltered areas), sun crust or wind press. The surface hoar is not widespread but is responsible for much of the larger avalanches that occurred earlier this week. This layer should be on your radar, as it may be susceptible to rider triggers.

Confidence

Good

Weather Forecast

Moderate to strong southwest winds and another 3-5 cm of new snow are expected by Monday morning. Continued unsettled weather is forecast for Monday bringing some flurries during the day. A small ridge of high pressure may provide some clearing skies during the night or early Tuesday morning with building northwest winds. Snow should start during the day Tuesday as winds continue to build and veer towards the west. Periods of moderate precipitation are forecast overnight resulting in about 5-10 cm of new snow with a freezing level of about 500 metres. The winds should calm and clock back to the northwest on Wednesday as a weak ridge passes through the region before the next Pacific frontal system approaches.

Avalanche Summary

No new avalanches have been reported from the region.

Régions couvertes