Bulletin d’avalanche

Waterton Lakes

Apr 16 – 17, 2015Parks Canada
Voir sur la carte
Archivé · expiré 11 years ago

Danger d’avalanche

Sat
Sun
Alpin
Sans niveau
Limite forestière
Sans niveau
Sous la limite
Sans niveau
Ouvrir la carte complète

Points saillants

Although Avalanche Hazard will persist as long as snow remains, we will no longer be producing regular avalanche bulletins for the 2014/2015 season. To contact Waterton Lakes National Park Visitor Safety staff call 403 762 1473 during business hours.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Cornices have grown to be quite large and are susceptible to the powerful solar heating at this time of year. A falling cornice can create a large avalanche on the slope it hits giving them surprising reach in their destructive potential.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–2
    As surface snow melts with heating it becomes weak and will fail. With momentum these events gain size and can easily entrain more snow especially as water lubricates a buried crust. Although these slides move slowly they pack a considerable punch.

  • Wet Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Recently formed windslabs and many long buried weak layers will produce slab avalanches as the snowpack heats up and looses strength. Both Loose Wet and Cornice activity could provide a heavy load to a slope acting as a trigger to these waiting slabs

Weather Forecast

Freezing levels are forecast to climb to 3200m Friday. Cooling over the weekend will be short-lived ahead of a return to warm temps next week. This puts us into spring weather patterns with warm, sunny days and cold nights. In weeks to come, watch for spring storms to bring a return to winter conditions especially at upper elevations.

Snowpack Summary

Powerful heating has now created moist surface snow to mountain top. With freezing crusts will form. Recent snow combined with west winds have created hard windslabs in alpine areas over recent crusts that run to at least 2400m on even the shaded slopes. While snow exists as low as 1500m, very little coverage can be found below 2000m.

Avalanche Summary

As freezing levels reached mountain tops today avalanche activity spiked with loose wet avalanches to size 2 out of many of the steeper slopes. While there was some dry slab activity earlier in the week with recent snow failing over buried crusts, loose wet activity today was triggering these same slabs with more of a wet slab character.

Confidence

Régions couvertes