Bulletin d’avalanche

Purcells

Jan 9 – 10, 2015Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Diligence may be required to maintain conservative decisions when seeking decent riding conditions over the weekend.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–5
    A persistent weakness buried mid-December is primed for human triggers and wide propagations producing very large avalanches. Remote triggering from flat terrain and step-down from shallower weaknesses makes this problem especially tricky to manage.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    Recent storm snow has settled into thick slabs that are highly sensitive to human triggers, especially where wind-loaded Treat slopes that have yet to slide with suspicion.

Avalanche Summary

Reports from Thursday include several explosive triggered storm slab and persistent slab avalanches up to Size 3, some stepping down to deeper persistent weak layers near the ground.

Confidence

Good

Weather Forecast

The forecast period is looking mostly cloudy with a chance of light flurries especially on Saturday. Freezing levels remaining in valley bottoms for the forecast period, with no more warm air expected at higher elevations. Winds should remain generally light and variable.

Snowpack Summary

There is a great deal of variability across the region. The West and South have received up to 60 cm of storm snow earlier in the week, quickly followed by high freezing levels and warm air up into the alpine which has resulted in a breakable surface crust. The North and East of the region have had 20-30 cm of cold dry new snow which has since been redistributed into touchy soft wind slabs, while large surface hoar is growing in sheltered areas. Deeper in the snowpack there is a persistent weak layer of surface hoar and crust that is now down about 30-80 cm. Recent snowpack tests on the West side of the range produced easy resistant results down 25 cm in the recent storm snow, and moderate to hard but sudden results down 80-90 cm on buried surface hoar sitting on a crust.

Régions couvertes