Bulletin d’avalanche

Jasper

Apr 7 – 8, 2018Parks Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Mon
Tue
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

Good skiing is found in the region with continued winter like conditions.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Windslabs have developed in exposed alpine and treeline locations 10-30cm thick. They are generally well bonded but pockets of instability exist. Some propagations of 50-100m were noted last week.   

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Cornices continue to grow with fresh snow and wind. Several failures were noted in the past week with some triggering a slab below. Potential for cornice failures increases with sun and warmth.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–3
    Persistent slabs sit on facets on North aspects and a hard melt-freeze crust on solar aspects. Use a cautious approach in open terrain and assess the bond at these interfaces before committing to a slope.

Weather Forecast

Sunday will be sun and isolated flurries, trace of snow, high of -2, light West winds and 2100m freezing level. Monday will be flurries, trace snow, -5 to -3, and light gusting moderate West winds. Tuesday will be flurries, 5-10cm of snow, -6 to -1,  and light gusting strong SW winds.

Snowpack Summary

Snow from March 30th and light amounts since has been blown in to an isolated wind slab up to 30cm thick. This has added to the previous slab sitting on a sun-crust on solar aspects and facets on North aspects - buried as deep as 60cm. The snowpack is generally facetted and weak underneath the slab particularly in shallow areas.

Avalanche Summary

Read and share conditions in the region by visiting  Avalanche Canada's Mountain Information NetworkCornice failures reported early last week have triggered persistent slabs below ridge-tops.

Confidence

Timing or intensity of solar radiation is uncertain

Régions couvertes