Bulletin d’avalanche

Jasper

Jan 29 – 30, 2023Avalanche Canada
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Archivé · expiré 4 years ago

Danger d’avalanche

Tue
Wed
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible

Points saillants

10-20 cm of light new snow arrived Jan 27th with cold temperatures and North winds are reverse loading terrain. Allow the snowpack to adjust to these changes.

Problèmes avalancheux

  • Wind Slabs

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

    Moderate north winds at ridge top are creating wind slabs on Southerly slopes which don't typically see wind loading. The wind slabs from previous moderate to strong SW winds are also still present.

  • Loose Dry

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

    The new low density snow will be sluffing out of steep terrain especially if there is a trigger like strong direct sun.

  • Deep Persistent Slabs

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

    The bottom of the snow pack is inherently weak with well developed Facets and Depth Hoar. Avalanches initiating in the upper snowpack are likely to step down to this layer and gain significant mass.

Snowpack Summary

10 to 20cm of new snow from Jan 27th overlies a melt-freeze crust up to 2000m. Steady moderate north winds at ridge top are creating windslabs. Generally, the bottom is a weak facetted snowpack. The snowpack ranges from 50 to 120cm.

Weather Summary

Sunday is to be cold, clear, and dry. Monday - Wednesday will bring clouds and sun, slightly warmer temperature, and light to moderate Northerly winds.

Detailed weather forecasts from Avalanche Canada: https://avalanche.ca/weather/forecast

Terrain and Travel Advice

  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.
  • If triggered, loose dry avalanches may step down to deeper layers resulting in large avalanches.

Confidence

Moderate

Avalanche Summary

No field patrol occurred on Saturday and nothing new reported. Wednesday-Thursday snowballing and loose wet activity was noted on steep west aspects near Weeping Wall. Thursday a large avalanche was observed in the Icefields starting in the Alpine, running on deep facets, and travelled far below treeline.

Don't forget to post avalanche observations to the MIN.

Régions couvertes