Bulletin d’avalanche

Purcells

Dec 8 – 9, 2019Avalanche Canada
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Archivé · expiré 7 years ago

Danger d’avalanche

Tue
Wed
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Expect to see cooler drier conditions prevail into the early part of the week.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2

    Recent southwest winds switching to northwest have created windslabs on a variety of aspects.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–2.5

    Recent cold temperatures have reduced strength and faceted the snowpack.

Confidence

Moderate - Uncertainty is due to extremely variable snowpack conditions reported through the region.

Weather Forecast

Saturday Night: Scattered flurries, alpine temperature -10, light to moderate northwest wind.

Sunday: Mix of sun and cloud. Alpine temperature -9, light to moderate northwest wind.

Monday: Cloudy with sunny breaks. Alpine temperature -8, light northwest wind.

Tuesday: Cloudy with sunny breaks. Alpine temperature -8, light northwest wind.

Avalanche Summary

Reports from Thursday and Friday indicate explosives triggered size 1-2 wind slab avalanches, mostly on northerly alpine features.

Snowpack Summary

15-35 cm of new snow accumulated in the north of the region through the past week with lesser amounts around Panorama and south. The new snow has covered surface hoar in sheltered areas and various wind-affected surfaces elsewhere.

The old wind-affected snow sits over a crust on solar aspects in the alpine or a surface hoar/crust combination around treeline. The surface hoar is down 25-45 cm and seems to be isolated to the north of the region or areas with a relatively deeper snowpack.

There are a variety of crusts buried in the mid to lower snowpack. These crusts have begun to break down. The base of the snowpack generally consists of facets and depth hoar.

Régions couvertes