Bulletin d’avalanche

Jasper

Jan 18 – 19, 2020Parks Canada
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Archivé · expiré 7 years ago

Danger d’avalanche

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

Points saillants

As temperatures warm and winds pick up, avalanche danger will increase.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3

    New wind slabs forming on easterly aspects at ridgetop along with cornice growth. Buried wind slabs on all aspects in the alpine could become more reactive as temperatures warm.

  • Loose Dry

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

    Up to 15cm new snow not bonding well to previous surface. As temps warm expect continued dry loose out of steep terrain.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3

    The recent cold weather has promoted facetting and weakening of the snowpack compromising the bridging strength. Potential for triggering these deeper layers could increase as temperatures warm.

Weather Forecast

Temperatures will continue to warm over the next few days and the inversion will dissipate. Winds will become westerly and increase as well.

Find the Alberta Rockies weather synopsis here: Avalanche Canada Mountain Weather Forecast

Snowpack Summary

Continued faceting of snowpack. Up to 15cm of new light dry snow is not bonding well to the upper settled pack. This overlies a weakening mid-pack comprised of varied facet forms. This provides some questionable bridging over the basal facets and DH. HS average at TL: ~145cm.

Avalanche Summary

Widespread dry loose avalanche cycle over the past 60 hours up to size 2. An ice dagger collapse off of Curtain Call produced a size 1.5 failing on ground.

Confidence

Wind effect is extremely variable on Sunday

Régions couvertes