Bulletin d’avalanche

Jasper

Apr 16 – 17, 2013Parks Canada
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Archivé · expiré 13 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

Travel is good at lower elevation on a widespread and supportive melt freeze crust, and good skiing can be found up high in sheltered Northerly terrain.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    Windslabs can be found on lee aspects in exposed terrain around ridgecrests. Where these slabs sit on previous crusts, the likelihood of a skier triggered avalanche increases.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    Cornices are large and are a hazard by their sheer mass. They can also trigger deeper layers if failure occurs. Several cornice failures were observed last week - some initiated storm slabs and a few deeper releases.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Numerous loose dry point releases were observed today, mostly from steep and rocky terrain with a solar aspect. These avalanches are triggered by afternoon heating and solar influence.

Weather Forecast

Cool temps with good overnight freezes continuing until Thursday, when a warming trend pushes freezing levels up to 2000m. Convective snow showers possible, with the heaviest amounts forecasted for the North Rockies. Winds light westerly.

Snowpack Summary

Windslabs exist on lee aspects of exposed ridgecrests above treeline with a dusting of snow overtop. Buried temperature crusts below 2100m and sun crusts on steep solar aspects at various elevations. Cornices are big and heavy. Some reverse loading of exposed terrain due to moderate North winds in the past few days.

Avalanche Summary

Several point releases producing loose dry avalanches to size 1.5 on steep, rocky terrain, primarily on solar aspects. Flight in the Chaba and Maligne drainages observed no new slab avalanches or recent cornice failures.

Confidence

Régions couvertes