Bulletin d’avalanche

Jasper

Feb 4 – 5, 2024Avalanche Canada
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Archivé · expiré 3 years ago

Danger d’avalanche

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

Points saillants

Colder temperatures have helped to improve snowpack stability but it may still be possible to trigger a persistent or deep persistent slab. Our snowpack height is extremely variable avoiding shallow rocky start zones is unrealistic at the moment.

Problèmes avalancheux

  • Persistent Slabs

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

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

  • Deep Persistent Slabs

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

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

Confidence

Moderate

Avalanche Summary

Natural avalanche activity has tapered off with no new avalanche activity observed on the Icefields Parkway or Maligne Lake Road on Friday or Saturday.

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

A 1-6 cm crust exists up to 2500m. A sun crust can be found on solar aspects at higher elevations as well.

Persistent weak layers, formed in early January, are down 20-30cm in sheltered areas. The bottom of the snowpack is made up of well-developed facets and depth hoar creating our deep persistent problem.

Weather Summary

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

Sunday Mainly cloudy with isolated flurries. Trace precipitation. Alpine High -6 °C. Light East Wind 10-20km/h. Freezing level 1500m.

Monday Cloudy with sunny periods. Light ridge wind. Freezing level valley bottom.

Tuesday Cloudy with sunny periods and isolated flurries. Trace precipitation.

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