Bulletin d’avalanche

South Columbia

Apr 1 – 2, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Wed
Thu
Alpin
1 · Faible
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–6
    Cornice falls are a concern during warming. Slopes with corniced entrances, or exposed to cornice falls should be avoided. It is possible that the weight of a cornice dropping onto the slope below could trigger an avalanche on the Mid-March crust.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    Keep an eye on changing conditions: Avalanche activity, snowballing, moist and wet snow are initial indicators of deterioration and increased hazard.

Confidence

Fair - Intensity of incoming weather is uncertain on Wednesday

Weather Forecast

Tuesday/Wednesday: The ridge of high pressure should begin to break down. Light/thin clouds are possible with temperatures slowly falling to more seasonal values. Expect light to moderate westerly winds. There is a slight chance of isolated flurries developing late on Wednesday.Thursday: A high pressure system builds promoting clear and dry conditions with light westerly winds and 1800m freezing levels.

Avalanche Summary

Solar aspects have been very active showing lots of natural loose wet avalanches and cornice releases up to size 2.5.

Snowpack Summary

Surface faceting and surface hoar growth ( up to 20 mm) has been prevalent on shady slopes at upper elevations, while the surface snow on sun-exposed slopes and at lower elevations has been subject to daily melt-freeze cycles. Cornices are large and weak.Surface hoar buried March 10th is down 100cm in most places. This layer seems to be bonding in most places and is a low probability - high consequence problem. Triggering may be possible with a very large load (cornice fall) or hitting the sweet spot in thin, variable snowpack areas.

Régions couvertes