Bulletin d’avalanche

Jasper

Jan 12 – 13, 2014Parks Canada
Voir sur la carte
Archivé · expiré 13 years ago

Danger d’avalanche

Sun
Mon
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
Ouvrir la carte complète

Points saillants

The Icefields Parkway is closed due to high avalanche danger.  It will not open until control work has been completed.  The new storm snow is unstable and will need time to stabilize.  Resist the urge and stick to safe lines on lower angle terrain!

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    These winds slabs have now been buried by the new snow so will be hard to locate. 

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–4
    >35 cm of storm snow has fallen in the past 24 hrs and has been redistributed by moderate SW winds. This new snow is overloading the weak snowpack below resulting in large deep avalanches.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    2–4
    In many areas, the basal facet weakness has been avalanched away, where this has not happened, there is a lot of snow sitting on top of this unstable weakness.

Weather Forecast

The major storm has past however further amounts of up to 20-30 cm are possible by Monday night.  Winds are expected to increase to strong from the W to NW.  Temperatures will dip Sunday morning then rebound.  Temperatures will increase to above freezing with the possibility of rain later in the week.

Snowpack Summary

>35cm of storm snow has fallen since Friday.  Moderate SW winds have created deep soft slab conditions in the alpine and open TL slopes.  In many locations, these new slabs are sitting on weak basal facets.

Avalanche Summary

Very poor visibility precluded avalanche observation however numerous large avalanches were heard through out the day from the Icefields to Sask Xing.  Sluffing of storm snow on steep banks was observed as well as soft slab avalanches to sz 1.5 at treeline.

Confidence

Intensity of incoming weather systems is uncertain on Monday

Régions couvertes