Bulletin d’avalanche

Jasper

Feb 17 – 18, 2021
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Archivé · expiré 6 years ago

Danger d’avalanche

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

The Tonquin Area is officially open for winter travel. Use caution as this is typically more shallow and therefore a weaker snowpack.

Problèmes avalancheux

  • Wind Slabs

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

    Moderate to strong SW winds in the alpine and higher RH values are likely creating wind slabs.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–1.5

    The likelihood of triggering increases with warming temperatures and solar input. Isolated, sheltered features that have not been impacted by winds are susceptible to sluffing and loose dry avalanches. Ice climbers be aware of these features.

  • Deep Persistent Slabs

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

      Caution in thin snowpack areas where triggering is more likely. This is a low probability but high consequence problem.

Weather Forecast

Wednesday: A mix of sun and cloud. Alpine temperature: High -13 C. Ridge wind NW: 10 km/h.

Thursday: A mix of sun and cloud. Alpine temperature: Low -16 C, High -12 C. Ridge wind southwest: 10 km/h.

Friday: A mix of sun and cloud with isolated flurries. Precipitation: Trace. Alpine temperature: Low -16 C, High -10 C. Ridge wind SW: 15-35 km/h.

Snowpack Summary

Moderate to strong SW winds and higher humidity are likely creating wind slabs in the alpine on lee features. The upper snowpack has facetted from the recent cold temperatures and overlies a supportive mid-pack, except in shallow areas where the entire snowpack is weak and facetted.

Avalanche Summary

On Sunday one sz 3 avalanche (wind slab) observed from extreme, alpine, north aspect terrain. No other avalanches observed.

Confidence

Due to the number and quality of field observations

Régions couvertes