Bulletin d’avalanche

South Coast Inland

Jan 28, 2018Avalanche Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Mon
Tue
Alpin
4 · Fort
Limite forestière
4 · Fort
Sous la limite
4 · Fort
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Points saillants

Natural avalanche cycle expected on Sunday. Travel in Avalanche terrain is not recommended.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1.5–2.5
    Large amounts of new snow and high winds will create tinder cornices sensitive to human triggers.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–2.5
    New snow and wind will create touchy storm slabs reactive to human triggers.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3.5
    Intense loading of new snow may awaken deeply buried weak layers resulting in large, destructive avalanches.

Confidence

High -

Weather Forecast

SUNDAY: 20-30 cm of new snow (rain below roughly 1200m) / Strong to extreme southwesterly ridgetop winds / Freezing level rising to around 1500m.MONDAY: 10-20 cm of new snow (rain below roughly 1500m) / Strong to extreme southwesterly ridgetop winds / Freezing level rising to around 1800m.TUESDAY: Cloudy with flurries; 3-5 cm / Strong southwesterly ridgetop winds / Freezing level dropping to around 700m.

Avalanche Summary

On Thursday, two natural storm slab avalanches stepped-down to facets at the bottom of the snowpack and resulted in 3-3.5 avalanches. They occurred on north and south aspects between 2000 and 2250 m. The extended period of continuous loading of the snowpack may begin to reactivate deeply buried weak layers resulting in large and destructive avalanches running full path.

Snowpack Summary

10 cm of new snow on Friday morning brings recent storm totals to 80-110cm. This weekend's storm will likely create dense storm slabs lurking in lee and cross-loaded features at treeline and above.90-120cm below the surface you'll likely find a few crusts that were buried during the first few weeks of January. Due to limited observations, not much is known about the current reactivity of these layers.The lower snowpack includes the mid-December crust layer. The load of the new snow may tip the balance and reactivate this layer in isolated terrain - particularly in the north of the region where it's shown prolonged reactivity in snowpack tests.

Régions couvertes