Bulletin d’avalanche

Waterton Lakes

Mar 1 – 4, 2016Parks Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

We are back to winter conditions for a short spell, heralding heightened avalanche danger. Moderate amounts of new snow will improve skiing, but will be strongly wind affected in exposed terrain.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Strong SW winds have blown recent snowfall onto lee slopes, forming Wind Slabs. Expect these to grow in size on Tuesday / Wednesday, with more snow and Strong to Extreme winds forecast.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Cornices have been growing in size. These may fail at any time, although should be given an especially wide berth when temperatures are warm, and/or snow is being transported by wind.

Weather Forecast

Cool temperatures on Tuesday morning rise through the day, with SW winds increasing from Moderate to Strong. 5-10cm of snow is forecast for early Wednesday morning. Wednesday and Thursday should see flurries, Freezing Levels from valley floor to 1900m, and Moderate to Strong SW winds.

Snowpack Summary

Crusts and wind affect make for tricky skiing in places, but make for fast travel below treeline. New snow is being blown around by Strong SW winds, developing cornices on ridges, and wind slabs on many lee slopes. A crust-facet combo buried 40-70cm has strengthened somewhat, but has continues to produce sudden test results on some slopes.

Avalanche Summary

Fresh cornices on Forum Ridge on Sunday were reactive to human triggering, but only propagated a few meters. On Monday, a neighboring operation observed a large slab avalanche on a north aspect in the backcountry. It was naturally triggered in extreme terrain by cornice fall.

Confidence

Intensity of incoming weather systems is uncertain

Régions couvertes