Bulletin d’avalanche

South Columbia

Mar 16, 2017Avalanche Canada
Voir sur la carte
Archivé · expiré 10 years ago

Danger d’avalanche

Fri
Sat
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
Ouvrir la carte complète

Points saillants

Continued precipitation Wednesday night into Thursday combined with moderate to strong southerly winds and the potential for the sun to come out on Thursday will continue to keep avalanche danger ratings elevated.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–4
    Various persistent weaknesses strewn throughout the snowpack create the potential for large step-down avalanches. Warming is expected to increase the likelihood of these large avalanches, especially with cornice-fall triggers.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Weaknesses within the recent storm snow are susceptible to human triggering. These storm slabs are particularly deep and touchy on slopes loaded by southerly winds and have the potential to step down to deeper buried weak layers.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Rain below 2000m has made the surface snow wet. As temperatures slowly cool there may still be the lingering possibility of triggering loose wet avalanches that step down to deeper weak layers.

Confidence

Moderate - Forecast snowfall amounts are uncertain on Thursday

Weather Forecast

THURSDAY: Cloudy with scattered flurries / Moderate to strong southwest wind / Alpine temperature -7 / Freezing level: 1000mFRIDAY: Mix of sun and cloud scattered flurries / Moderate south wind / Alpine temperature -4 / Freezing level 1300mSATURDAY: Flurries, accumulation 15-20cm / Moderate to strong southwest wind / Alpine temperature -3 / Freezing level 1800mMore details can be found on the Mountain Weather Forecast.

Avalanche Summary

The past 3 days have seen a widespread natural avalanches to Size 3 at all elevations and on all aspects. Many of these triggered in the storm snow with some also stepping down to persistent weaknesses deeper in the snowpack. Wet slabs and loose wet avalanches have also been reported below treeline.

Snowpack Summary

Around 60-90cm of new snow has fallen at upper elevations over the past several days and has been redistributed by light to moderate southerly wind. Warm temperatures on Sunday through Tuesday has resulted in moist and/or wet surface snow on all aspects up to 2100m. The new snow sits on top of faceted snow as well as isolated small surface hoar in sheltered areas and a thin sun crust on steep southerly aspects. The persistent weakness buried late-February is now down 80-140 cm, and is composed of weak facetted crystals on a thick rain crust as high as about 1800m and facets on sun crust on steep southerly aspects. The mid and lower snowpack are well settled and stable in deeper snowpack areas, but may be weak and faceted in shallow areas.

Régions couvertes