Bulletin d’avalanche

South Rockies

Dec 28 – 29, 2014Avalanche Canada
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Archivé · expiré 12 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

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Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    Strong and variable winds have redistributed loose surface snow into wind slabs in lee terrain. Watch for triggering behind ridge crests and terrain breaks.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–4
    A crust which formed in December should remain on your radar. Not much is known about its distribution in the South Rockies. However, in neighboring regions it has produced large avalanches. Dig down and test weak layers before committing to a line.

Confidence

Poor - Due to the number of field observations

Weather Forecast

A dry arctic ridge will dominate the region for the forecast period. Skies will be mainly clear with ridge top temperatures hovering at about -25, and moderate northeasterly winds.

Avalanche Summary

Wind slabs to size 2.5 were observed in high elevation terrain in the south of the region on Saturday. In one reported case, a wind slab in motion stepped down to the buried December crust.

Snowpack Summary

On the surface, up to 30cm of low-density snow exists. In the alpine and at treeline, strong to locally extreme winds have been conducive to blowing this snow into large and reactive wind slabs in exposed lee areas. 50 - 70 cm below the surface (more in wind affected areas) you may find a crust which formed in December. The crust, which may have surface hoar on top of it, may extend into the alpine to at least 2100 m. Where the crust exists, it may be bridging triggers from penetrating to deeper persistent weaknesses that formed earlier in the season. However, on high alpine slopes above where the rain crust formed, or in areas where rain didn't occur, deeply buried facets may still be susceptible to triggers.

Régions couvertes