Bulletin d’avalanche

Cariboos

Feb 14 – 15, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

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

New wind slabs have been reported to be deeper than expected and easy to trigger. New storm slabs are also reported to be easy to trigger and running fast on a combination of crusts and buried surface hoar.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    2–5
    New wind slabs are reported to be up to 70 cms deep in some areas and easy to trigger by human activity.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–6
    There are older layers of buried surface hoar and crusts that are buried down about 80-110 cms. These layers continue to show results in snow profile tests and may be triggered by large additional loads.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–5
    A new soft storm slab has developed above surface hoar and sun crusts that developed during the recent clear weather. The new storm slab is between 20-40 cms deep and reported to be easy to trigger by skiers or snowmobilers (riders).

Confidence

Fair - Due to variable snowpack conditions for the entire period

Weather Forecast

Overnight and Friday: Some light precipitation is expected over the Northern parts of the region. Strong Northwesterly winds should diminish to moderate Westerly during the day. Alpine temperatures rising up to about -2.0 during the day as the freezing level rises to about 1300 metres.Saturday: Expect 5-10 cms of snow as a trough moves across the interior regions. Winds should be moderate Westerly with strong Northwesterly gusts. Alpine temperatures are expected to cool down to about -7.0 as a cold front associated with the trough moves through the region.Sunday: Another ridge of high pressure is expected to build over the interior, bringing cooler temperatures and drier conditions.

Avalanche Summary

Natural avalanches were reported up to size 3.0 from Wednesday. The new storm slab and wind slabs have been reported to be easily triggered and result in avalanches size 2.0-2.5. Some areas experienced remote triggering of the storm slab from adjacent terrain.

Snowpack Summary

There is a lot of variability in the new snow amounts across the region. New storm slabs are between 10-40 cms deep, and new wind slabs are up to 70 cms deep due to strong Northwest winds transporting the available new snow. Tests are showing easy to moderate shears at the storm snow interface. There are a couple of deeper buried surface hoar and crust layers that have been giving hard resistant planar results in snow profile tests. These deeper layers are not expected to be triggered by light additional loads, but may be triggered by storm snow avalanches in motion, or cornice fall.

Régions couvertes