Bulletin d’avalanche

Jasper

Jan 2 – 3, 2019Parks Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Snowpack depths and avalanche problems vary significantly through out the forecast region. Re-assessment is essential if you are venturing into new areas.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2.5
    The recent snow came with strong winds at all elevations, wind effect is visible in all open terrain.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–3
    The new snow has added to the load on the Dec 11th weak interface. Buried more than a meter deep in some locations, this layer is strengthening but has been reactive to large triggers such as cornices recently.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Be particularly cautious in steep areas with shallow snowpack, were the new snow is sitting on unconsolidated facets and depth hoar.

Weather Forecast

A ridge of high pressure to our south gets pushed out by a frontal system later in the week.  Wednesday: mostly cloudy with isolated flurries. Alpine temps high -8C, low -10C. Winds will be L-M SW.Snowfall Wed. night through Friday with total accumulations of up to 50cm.A detailed mountain weather forecast is available from Avalanche Canada.

Snowpack Summary

35cm of low density snow that fell in the southern half of the region on Saturday. Strong to extreme SW winds during the storm produced widespread wind effect in any open terrain. The Dec. 11th interface is still easily identified down 50-110cm and continues to produce hard but sudden test results, and was reactive to large triggers recently.

Avalanche Summary

Little natural activity noted on Monday's field trip to E facing slopes across from Mt. Coleman and visibility was good. One recent large avalanche in the Boundary area likely failed on the Dec. 11th interface, and scrubbed to ground in places. Sunday's avalanche control produced loose dry avalanches to size 1.5 on the immediate roadside targets.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

Régions couvertes