Bulletin d’avalanche

Banff Yoho Kootenay

Dec 16 – 17, 2018Parks Canada
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Danger d’avalanche

Mon
Tue
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Continued natural activity today with touchy slabs at all elevations reacting easily to skier and explosive triggers. Avoid avalanche terrain. Avalanche control is planned on  Mt Dennis and Mt Whymper Sunday. No skiing or climbing in these areas.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–2.5
    Up to 40 cm of recent snow along with strong winds will have created storm slabs and wind slabs at all elevation. These slabs are reactive to skier triggering and are running long distances. Ice climbers pay attention to overhead hazard.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1.5–3
    The mid and lower portions of the snowpack are weak and are now overloaded with critical levels of snow. We expect avalanches to step down to this deeper layer.

Weather Forecast

Winds and snow are forecast to back off overnight Saturday as a ridge brings cooler temps near -16C at 2000m. Temps will climb to -10C as winds pick back up to moderate  SW later on Sunday. On Monday, expect temperatures to climb a bit and winds to stay elevated in the moderate range as the next wave of precip arrives from the Coast.

Snowpack Summary

40 - 60 cm of snow since Dec 10 forming a storm slab over facets and surface hoar. New windslabs are common on lee (mostly east) aspects. The lower snowpack is weak and facetted with some avalanches running to ground.

Avalanche Summary

Skier triggered avalanches at Emerald Lake and Wawa Bowl near Sunshine today with another close call in West Bowl at Lake Louise yesterday. Numerous natural and skier or explosive triggered avalanches over the past few days up to size 2.5 have been reported. Avalanches may run further downslope than expected, so be cautious of overhead hazard.

Confidence

Intensity of incoming weather systems is uncertain on Monday

Régions couvertes