Bulletin d’avalanche

Cariboos

Dec 28 – 29, 2011Avalanche Canada
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Archivé · expiré 15 years ago

Danger d’avalanche

Fri
Sat
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    2–5
    Recent storm snow is building up deeply on lee slopes as it is shifted by the wind. Be alert for wind slabs behind ridges and terrain breaks and in gullies

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–6
    A buried surface hoar layer remains a concern. It is now buried about 80-100cm deep.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    Up to 80cm of storm snow has fallen with warming temperatures. This is likely to have caused storm slab development.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Wednesday night: 15cm, possibly more in western areas. Moderate to strong west to south-west winds. Freezing level lowering to near valley floor.Thursday: Light snowfall. Light-moderate north-westerlies. Freezing level near valley floor.Friday: Light snow. Light south-west winds. Freezing level around 1000m. Saturday: Light flurries. Cooling temperatures. Light north-westerly winds.

Avalanche Summary

A size 2 naturally-triggered storm slab was observed on a west aspect at 2400m.

Snowpack Summary

40-80cm of total storm snow has been reported. Rising temperatures during the storm are likely to have helped form slabs within the new snow. Wind slabs exist on slopes lee to the west in the alpine and in open areas at treeline and below. A surface hoar/facet/crust interface is buried anywhere from 80-100cm deep. Avalanche activity on this layer has slowed, but it remains a concern as snow-loading gradually builds this week, particularly on slopes which did not avalanche last week. This layer is still showing easy results in some areas. A low elevation melt-freeze crust buried about half a metre deep is also one to watch. A sun crust is also buried in the alpine on some steep south and west aspects. The mid-pack is generally strong and well settled.

Régions couvertes