Bulletin d’avalanche

Purcells

Dec 9, 2016Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible

Points saillants

Changing wind directions may deposit snow in unusual locations. Constantly evaluate the conditions as they change with elevation and aspect.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Cold temperatures and variable winds have preserved pockets of wind slab in the alpine and at treeline.

Avalanche Summary

No new avalanches reported from this region. I suspect that pockets of wind slab may become more stubborn to trigger, but also may propagate further once they are released.

Confidence

Moderate - Wind effect is extremely variable

Weather Forecast

Some cloud developing overnight combined with light southerly winds and alpine temperatures around -20. Mostly cloudy on Friday with a chance of sunny breaks. Winds becoming moderate from the southwest during the day with alpine high temperatures around -17. Light snow on Saturday with moderate southwest winds and alpine temperatures around -15. Light snow on Sunday with moderate southwest winds.

Snowpack Summary

Recent snow has formed wind slabs on northerly aspects in the alpine that are reactive to light additional loads like a single skier/rider. The cold temperatures and clear skies are developing near surface facets, and may be preserving surface hoar that was buried on the weekend. Alpine snow depths are around 120-170 cm, and the widespread mid-november crust is buried down around 70-90 cm. Snowpack and crust depths increase as you move west into the Selkirks. It sounds like there is a bit less snow on the ground in the south of the region, but we have not had many observations at this time. If you dig down to the crust, watch for facets developing above and below that may provide a hard surface with a weak sliding layer in the future. Please let us know what you find by posting to the MIN (Mountain Information Network).

Régions couvertes