Bulletin d’avalanche

Northwest Coastal

Apr 25 – 26, 2014Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Sun
Mon
Alpin
Sans niveau
Limite forestière
Sans niveau
Sous la limite
Sans niveau
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Points saillants

We are no longer issuing danger ratings for this region due to a lack of field data.Please refer to this blog post for more insight into managing the current conditions.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    New wind slabs may develop during the forecast unsettled weather. Wind slabs may not be well bonded to recent melt-freeze crusts. Stiff wind slabs may take a few days to settle and bond.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Snow may become moist or wet during periods of day time warming. Loose wet snow may release naturally from steep terrain.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    3–7
    Deeply buried persistent weak layers continue to be a concern for isolated hard to predict avalanches. Avalanches releasing on these deep layers may be more likely during periods of strong solar radiation, or when there is no overnight freeze.

Weather Forecast

Overnight and Saturday: Cloudy overnight with freezing levels dropping down to 1000 metres. Chance of some light precipitation combined with strong Southeast winds overnight and continuing during the day with freezing level climbing to 1500 metres.Sunday: Cloudy with Easterly winds and light to moderate precipitation. Freezing levels remaining between 1200-1400 metres.Monday: Continued unsettled weather with light precipitation and light to moderate Southwest winds.

Avalanche Summary

Expect new wind slabs and thin storm slabs to develop above recent melt-freeze crusts. These slabs may be easily triggered due to the hard sliding layer of the melt-freeze crust. Daily melt-freeze cycles may be weakening cornices, and they may fall off naturally or be easily triggered. Rain at lower elevations may cause new snow to weaken rapidly and slide out of steep terrain, sometimes gathering mass in constrained terrain features. Deep persistent weak layers may be triggered by rapidly warming temperatures, strong solar radiation, or rain.

Snowpack Summary

The spring snow-pack is comprised of many layers of melt-freeze crusts, thin new snow layers, and stiff wind slabs in the alpine. The snow-pack may be very different depending on elevation, with moist or wet snow in the valleys and near winter conditions in the alpine. The weather can change rapidly at this time of year, and this may result in different types of avalanche problems. Danger is most likely to increase if there is a substantial new snow storm with wind, or if the temperatures increase rapidly with or without sunshine. Our plan is to place a link in the headline that explains general risk scenarios associated with the forecast weather. We will not issue danger ratings for this region due to the lack of data as a result of professional operators closing for the season.

Régions couvertes