Bulletin d’avalanche

Cariboos

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

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
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
    Possible
    Taille
    1–4
    New wind slabs exist in alpine terrain in some parts of the region. Watch for triggering in unsupported lee terrain.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–5
    Snow stability can deteriorate very quickly with spring temperatures. Watch for loose wet avalanches on steep terrain, especially if the sun is shining.

  • Wet Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–5
    Buried crusts will provide an ideal sliding layer for wet slabs, especially on sun-exposed slopes or with warmer temperatures at lower elevations. Spring temperatures will also promote glide crack activity.

Confidence

Fair - Timing or intensity of solar radiation is uncertain on Monday

Weather Forecast

Monday: clear conditions in the morning with light to moderate snowfall developing by mid-day and intensifying slightly overnight / moderate to strong southwest winds / freezing level at 1900m Tuesday: broken cloud / light to moderate westerly winds / freezing level at 1800m Wednesday: light snowfall / light to moderate southwest winds / freezing level at 1600m

Avalanche Summary

A size 2 cornice fall was observed on Saturday on an east aspect at 2500m. It did not release an avalanche on the slope below. On Sunday, numerous wet loose avalanches to size 2 were observed on solar aspects.

Snowpack Summary

Last week, very warm temperatures affected all but the highest north facing slopes. Since Thursday morning, mostly light to locally moderate amounts of new snow have fallen forming soft slabs on the resulting crust while rain has continued to penetrate and weaken the snowpack at lower elevations. Up to 80cm below the surface, you will find another crust in the alpine and at treeline that may have been reactive with warming throughout last week. The mid-February buried surface hoar layer is down about 200 cm, although avalanches releasing on this layer represent an extremely low probability-high consequence scenario. Cornices in the region are very large. With spring temperatures, these are more likely to become weak and fail. They could provide a large enough trigger to release deep layers on slopes below.

Régions couvertes