Bulletin d’avalanche

Waterton Lakes

Mar 25 – 27, 2014Parks Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Stay alert to the many changes in the snowpack that the weather will bring in the next few days.  Conditions vary greatly with aspect and elevation.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    With significant warming Tue and  incoming precipitation for the rest of the week, expect these slabs to become more reactive. Small changes in aspect and elevation seem to change the nature of these slabs so monitor what you are skiing on closely.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–2
    Heating on Tuesday will effect steep solar slopes and features such as cornices or snow near black bodies such as trees or rocks. Similarly,  with some potential for rain at low elevations Wednesday, be cautious with the slab over the buried crust.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    2–4
    This weak faceted layer from early Feb may still be an issue in isolated thin and high elevation locations. With the changing weather in the next few days, snow is likely to be moving: a falling cornice or small avalanche could trigger this layer.

Weather Forecast

Clear skies with high freezing level forecast for Tuesday. A series of systems that extends through the weekend beings with Light precipitation begins overnight Tuesday. Freezing levels reaching near 1700m Wednesday. Moderate precipitation and some cooling for Thursday. With a return to a westerly flow increased wind can be expected for the period.

Snowpack Summary

Continued small amounts of precip with little to no wind have added to the storm slabs over the 0314 interface now 40 to 60 cm deep. Crusts have formed on solar slopes. The 0314 interface is a rain crust that extends to around 2000m. Another rain crust below it is thinner but extends to 2300m and will likely limit activity from the Feb Facet layer.

Avalanche Summary

During this cold and calm period, Loose Dry Avalanches have been seen out of steep terrain for the last few days. Today, a small cycle of loose wet avalanches occurred with intense solar heating despite relatively cool air temperatures. Temperatures are expected to spike Tuesday with clear skies: expect an increase in avalanche activity to occur.

Confidence

Intensity of incoming weather systems is uncertain

Régions couvertes