Bulletin d’avalanche

Jasper

Dec 20 – 21, 2020
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Archivé · expiré 6 years ago

Danger d’avalanche

Mon
Tue
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

A series of storms will enter the region over the next few days. The more snow and wind we receive the higher the avalanche danger. Avalanche control forecasted on 93N between Sunday morning and Tuesday afternoon. Check 511 for up to date information

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2.5

    New snow and moderate to strong winds forming wind slabs on leeward and cross-loaded terrain features.

  • Loose Dry

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

    New snow may be reactive on the Dec 14th layer

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–3

    Be cautious of thick to thin snowpack areas being likely trigger locations. The new windslabs forming have the potential to step down to the weakness at the base of the snowpack.

Avalanche Summary

Road patrol south today no new avalanches observed. One recent wind slab size 2.5 avalanche was observed Friday that was out of a East facing alpine feature in the Mount Wilson area otherwise nothing else was observed. Over the last four days compression tests in the ice fields treeline and below produced no results.

Confidence

Intensity of incoming weather systems is uncertain on Saturday

Weather Forecast

Saturday night: Up to 25cm of new snow with continued moderate SW winds

Sunday: Periods of snow. Accumulation: 16 cm. Alp tmp: Low -9 C, High -3 C. Mostly light ridge wind occasionally gusting to 40 km/h. Freezing level: 1700 metres.

Mon and Tues: Accumulation: Up to 30cm.

Snowpack Summary

Up to 30cm of storm snow over last few days. SW winds continue to build wind slabs in the alpine and open treeline. Surface hoar down ~35cm in sheltered locations treeline and below. The midpack is generally supportive with a weaker base consisting of facets and some locations depth hoar. Avg depth is 65cm - 160cm depending on region and elevation.

Régions couvertes