Bulletin d’avalanche

Purcells

Apr 16 – 17, 2014Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Avalanche danger can rise very quickly with warming and solar radiation. Be aware of changing conditions and overhead hazards.For more insight into spring danger ratings, check out our Blog Post.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    Wind slabs immediately lee of ridge crest may still be sensitive to human triggering.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Expect to see an increase in avalanche activity with forecast rain at lower elevations or on solar aspects if the sun comes out for extended periods of time.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    4–8
    The potential for very large deep slab avalanches needs to remain on your radar. Cornice fall, strong solar, warming temperatures or a surface avalanche in motion could act as triggers.

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain on Thursday

Weather Forecast

Thursday:  Light to locally moderate precipitation. Winds moderate west. Freezing level 1800m.Friday:  Overcast with flurries or light snow. Moderate northwest  winds. Freezing level 1500m.Saturday: Mix of sun and cloud. Light west wind. Freezing level 2200m.

Avalanche Summary

Recent reports include loose wet avalanches running to size 1.5 solar aspects.

Snowpack Summary

There is moist/wet snow and/or a supportive crust on all aspects and elevations except for high elevation north-facing terrain. Three persistent weak layers exist in the highly variable snowpack of the Purcells. -The mid-March sun crust/surface hoar layer down 50-80cm seem and the early-March crust/facet/surface hoar layer down around 80-120cm seem to be laying dormant for the time being. -The mid-February crust/facet/surface hoar combo is typically down 60 - 120cm. Direct triggering of this layer has become unlikely, however, cornice fall, a smaller avalanche in motion or prolonged warming may wake this layer up, which would result in very large and destructive avalanches.-Weak basal facets exist in many areas, but triggering is unlikely.

Régions couvertes