Bulletin d’avalanche

Jasper

Apr 17 – 18, 2017Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

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

Possibility of rain at lower elevations will increase the avalanche hazard below tree line.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    SW winds has reactive alpine windslab on lee slopes just above tree-line. If triggered, these could step down to the deep persistent slab resulting in large avalanches.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    There are some very large cornices out there, give them a wide berth. Cornice failure is hard to predict but is more likely with inputs like solar radiation, high freezing levels and wind-loading.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–4
    The deep instability could be triggered by large loads such as a cornice failure or a surface avalanche. Human triggering is most likely from shallow spots or on steep unsupported slopes.

Weather Forecast

Cloudy with 5-10cm of snow by Wednesday morning. Freezing level rising to 2000m with an alpine high of -3 and light southwest winds.

Snowpack Summary

Windslab building on lee alpine ridge lines. Melt freeze crust up to 2000m. Dryer surface snow on northerly aspects over a solid mid-pack bridging the weak base above 2000m. The bottom of the snowpack consists of weak facets and depth hoar mixed around the Nov rain crust.

Avalanche Summary

No new avalanches observed or reported.

Confidence

Forecast snowfall amounts are uncertain on Tuesday

Régions couvertes