Bulletin d’avalanche

Purcells

Dec 15 – 16, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Mon
Tue
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    Thin new windslabs have developed in the alpine and at treeline.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–5
    Buried surface hoar layers continue to give results in snow pit tests. This layer may be triggered from thin weak spots on or adjacent to unsupported terrain features.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    3–7
    Avalanche activity on the deeply buried November rain crust is un-likely without new loading or a rapid rise in temperature. Avalanches that do release on this layer will be large and destructive.

Confidence

Fair - Intensity of incoming weather is uncertain on Monday

Weather Forecast

Overnight and Sunday: Moderate westerly overnight winds combined with 3-5 cms of new light snow is expected by Sunday morning. Alpine temperatures should be -10.0 and the freezing level is expected to remain at valley bottom for the forecast period.Monday: The Low pressure system that is tracking along the U.S border should bring some precipitation and strong Southwest winds to the region. The South of the region may get 10-15 cms and the North should get less; likely 5-10 cms.Tuesday: Unsettled weather and cooler temperatures are expected after the storm passes to the East. Forecast alpine temperatures are -15.0.

Avalanche Summary

Some thin soft slab avalanches up to size 1.5 were reported from ski cutting that were 20 cms deep.

Snowpack Summary

Some new surface hoar has been reported overnight. Thin windslabs have developed in the alpine and at treeline in exposed terrain. Some loose snow sluffing may be experienced in steep terrain. Snow pit test results continue to show weak layers of surface hoar that was buried during mid and late November, however we have not seen any activity on these layers recently. The early season rain crust is another layer that continues to show results in tests, but has not been active.

Régions couvertes