Bulletin d’avalanche

Jasper

Feb 15 – 16, 2018Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Fri
Sat
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Variable winds that were strong and gusty have provided new windslabs to navigate around while stripping much of the fun out of exposed alpine features.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2.5
    Up to 15cm of new snow with winds and warmer temperatures is creating fresh windslabs.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3.5
    Persistent slabs remain a problem. The main concern is for areas exposed to large triggers such as cornices or smaller avalanches / sloughing from above.

Weather Forecast

An additional 5-10cm of snow is forecast overnight, with light northerly winds and seasonal temperatures. Tomorrow will be dry and cool as arctic air pushes into the eastern side of the rockies. On Friday flurries will return with a slight increase in temperatures and this should continue through the weekend.

Snowpack Summary

5-10cm of new snow redistributed by variable winds that were strong tapering to light today. New wind slabs overlie a settled upper snowpack which is sitting on the persistent weak layers in the mid snowpack. Widespread avalanche activity on these weak layers followed last week's storm, slopes without avalanches are suspect.

Avalanche Summary

Isolated slab avalanches (likely failing on a persistent mid snowpack weakness, and up to size 2) were observed by field teams at treeline elevations on Tuesday - likely triggered by the significant wind transport and warmer temperatures.

Confidence

Wind effect is extremely variable

Régions couvertes