Bulletin d’avalanche

Jasper

Feb 11 – 12, 2017Parks Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

Sat
Sun
Alpin
4 · Fort
Limite forestière
4 · Fort
Sous la limite
3 · Marqué
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Points saillants

Avalanche Control along the Icefields Parkway is planned for Friday 1100 - 1700, expect delays.Strong winds and 20cm+ of snow have created dangerous avalanche conditions.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    2–3
    Moderate to strong SW winds building windslab with recent storm snow and expected to bond poorly.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–3
    Avalanches initiated within the storm snow were stepping down to deeper layers and in some cases gouging to ground in thin snowpack areas.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–3
    30-40cm of storm snow with warming temps has promoted fast settlement, forming a touchy storm slab.

Weather Forecast

The storm has ended but periods of light snow can be expected over the weekend. Alpine temps are forecasted to drop to -16 overnight and with a high of -12. Winds will be blowing moderate from the SW, gusting to strong. Temps will gradually rise until mid next week.

Snowpack Summary

30-40cm of snow within the past 36hrs with moderate to strong SW winds is building slab at treeline and above. A reactive storm slab can be found at all elevations and aspects. The upper snow pack has several touchy surface hoar and facet layers which are now buried 40-50cm and 60-80cm. The mid-pack is facetted and weak, with depth hoar at its base

Avalanche Summary

A widespread Na cycle up to Sz 2.5 on all aspects and elevations today along the Parkway. Poor visibility into the high alpine.While accessing a short and steep slope adjacent to the highway, an avalanche technician triggered the storm slab resulting in a full burial with no injuries.

Confidence

Wind speed and direction is uncertain on Saturday

Régions couvertes