Bulletin d’avalanche

Jasper

Feb 2 – 3, 2024Avalanche Canada
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Archivé · expiré 3 years ago

Danger d’avalanche

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

Freezing levels arn't dropping significantly until friday night. Be patient while the avalanche hazard remains elevated from the ongoing heat.

Recent warm weather and avalanche activity has created rugged and hazardous backcountry travel conditions.

Problèmes avalancheux

  • Persistent Slabs

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

    This layer is concerning when there is a cohesive slab overlying the January Facets and Surface Hoar layer.

  • Loose Wet

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

    Rain and warm temperatures have saturated much of the snowpack at treeline and below treeline. This has resulted in widespread wet loose avalanches happening in steep terrain. The snowpack below treeline will remain weak and saturated until temperatures cool down friday night.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1.5–3.5

    The base of the snowpack is inherently weak and untrustworthy. Human and natural triggering of these basal facets remains possible to likely.

Confidence

Moderate

Avalanche Summary

Natural avalanche activity tapered yesterday with a few loose wet avalanches reported below treeline. Although natural avalanche activity is tapering, the snowpack will remain unstable until the temperatures really cool down friday night.

Previous widespread avalanche activity over the past week produced numerous natural avalanches at all elevations. This included some impressive avalanches up to size 3.5 at higher elevations, as well as loose wet up to size 2.

Snowpack Summary

Previous Strong S and SW winds created wind slabs in the alpine areas where snow is still dry for transport.

Previous high freezing levels, rain, and solar radiation has formed a surface crust up to 2500m. Below 2100m 5-10cm of moist snow surface snow turns to a fully saturated snowpack around 1900m.

Persistent weak layers formed in early January are down 20-30cm in sheltered areas. Well developed facets and depth hoar make up the bottom of the snowpack.

Weather Summary

The Mountain Weather Forecast is available at Avalanche Canada https://avalanche.ca/weather/forecast

Friday

Mainly cloudy. Alpine temperature: High -1 °C, with freezing level at 2100 metres. Ridge wind west: 10 km/h.

Saturday

Mainly cloudy with isolated flurries (trace). Alpine temperature: Low -10 °C, High -6 °C and freezing level at 1500 metres. Light ridge wind.

Terrain and Travel Advice

  • Make conservative terrain choices and avoid overhead hazard.
  • Stick to non-avalanche terrain or small features with limited consequence.

Régions couvertes