Bulletin d’avalanche

Waterton Lakes

Dec 17 – 20, 2019Parks Canada
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Archivé · expiré 7 years ago

Danger d’avalanche

Wed
Thu
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible

Points saillants

Winds have been whipping in Waterton, be cautious of thin rocky areas where it may be possible to trigger deeper layers.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2

    Strong to extreme winds have stripped fetches in the alpine, leaving very little snow available for transport. Newer wind slabs exist at treeline and below, especially in burnt areas.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3

    Melt freeze crusts and facets from early season snowfalls are lurking at the bottom of the snowpack. Test results and previous avalanches lead us to believe human triggering of this layer is unlikely, but not out of the question.

Weather Forecast

Tuesday: Cloudy with sunny periods and no new snow. Strong SW winds and a high of -7.

Wednesday: Sun and cloud, moderate SW winds and a high of -5.

Thursday: Flurries depositing 5-10cm of new snow. Moderate SW winds and a high of -6

Snowpack Summary

A true rockies snowpack! Windslabs exist at all elevations, especially in burnt areas. A problematic weak crust facet combo formed in November is down 60cm, and additional crust/facet layers formed in October form the bottom of the snowpack.

Avalanche Summary

Scattered small naturally triggered windslabs have been spotted in lee areas at treeline and below in the past few days.

Confidence

Timing of incoming weather systems is uncertain on Friday

Régions couvertes