Bulletin d’avalanche

Jasper

Mar 11 – 12, 2025Avalanche Canada
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Archivé · expiré 2 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Be patient and give the snowpack time to heal for the next few days. Now is a good time to ski low angle terrain away from overhead hazards. Human-triggered avalanches are likely. Careful snowpack evaluation, cautious route-finding, and conservative decision-making is essential.

Problèmes avalancheux

  • Storm Slabs

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

    Storm slabs have the potential to trigger deeper instabilities.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    2–3.5

    This avalanche problem is associated with a weak facet and crust layer, buried at the end of January, down approximately 70cm in sheltered areas.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2.5–4

    Well developed facets and depth hoar at the bottom of the snow pack are still producing large avalanches in our region. Several large natural deep persistent slab avalanches released during or immediately after the storm.

Confidence

High

Avalanche Summary

On Monday, observations on the Icefields Parkway corridor revealed widespread natural avalanche activity from during the storm. Large slab avalanches, up to size 3.5, consisted of a mix of storm slab and persistent slab, with occasional step-downs to deeper instabilities. Avalanche control using explosives triggered large storm and persistent slabs with wide propagation. Some avalanche debris reached as far as the road.Tuesday Maligne patrol saw no new avalanches

Snowpack Summary

Up to 60 cm of new snow fell over the weekend. Below this fresh snow, the snowpack is complex, with multiple crusts and facet layers creating persistent weak layers. The bottom of the snowpack consists primarily of weak facets and depth hoar.

Weather Summary

Wednesday

Flurries. Accumulation: 6 cm. Alpine temperature: High -4 °C. Ridge wind south: 15 km/h gusting to 40 km/h. Freezing level: 1800 metres.

Thursday:Snow accumulation: 6 cm. Alpine temperature: Low -10 °C, High -5 °C. Mostly light ridge wind occasionally gusting to 35 km/h. Freezing level: 1500 metres.

Terrain and Travel Advice

  • Use conservative route selection. Choose simple, low angle terrain with no overhead hazard.
  • Storm slabs in motion may step down to deeper layers resulting in large avalanches.
  • Loose avalanches may step down to deeper layers, resulting in larger avalanches.
  • Avoid exposure to overhead avalanche terrain; avalanches may run surprisingly far.

Régions couvertes