Bulletin d’avalanche

Jasper

Apr 5 – 6, 2018Parks Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Sat
Sun
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Good skiing can be found in sheltered terrain.Persistent weak layers continue to show isolated signs of reactivity, this problem will likely persist for some time.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    In most cases this interface presents as a manageable surface instability and is expected to go dormant pretty quickly.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Cornices continue to grow with fresh snow and wind. Several failures were noted in the past week, in most cases triggering a slab below.

  • Persistent Slabs

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

Weather Forecast

The timeless struggle between good (spring wx and evil (Arctic like wx) unfolds in the bulletin region. Good is forecast to come about yet, another surge of evil... er, arctic air will hold the cold front in place and, as a result, cold. The systems continue to mix through the weekend and fxs are calling for more of the same in the short term.

Snowpack Summary

Recent snow 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 polar aspects - these are now buried as deep as 60cm. Underneath the variable slab in the upper snowpack, as well as in shallow areas, the snowpack is generally facetted and weak.

Avalanche Summary

No new avalanches observed or reported

Confidence

Intensity of incoming weather systems is uncertain on Saturday

Régions couvertes