Bulletin d’avalanche

Jasper

Jan 2 – 3, 2014Parks Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
1 · Faible
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Points saillants

Avalanche danger could increase dramatically through Thursday night if the snowfall exceeds the forecasted amount.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Lee aspects have an upper snowpack consisting of several hard windslabs which could release and affect the layers below it.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–3
      A shallow spot in the snowpack could trigger a windslab which in turn would step down and release the entire snowpack.

Weather Forecast

Weather forecasts indicate up to 15-20cm of snow starting Thursday night in the Icefields area while lesser amounts will be seen in Jasper and the Maligne lake area. Temperatures will remain warm through Thursday and then drop to -15 - 20 C  overnight on the weekend.

Snowpack Summary

The snowpack is characteristic of early season conditions, with a weak structure and highly variable distribution.  The Icefields area snowpack consists of several supportive windslabs over basal facets. Test results confirm that if a windslab layer releases in the upper snowpack, it could collapse the basal facets and slide full depth to ground.

Avalanche Summary

On December 31, several new slab avalanches were observed on cross loaded features at tree line and above.  A skier accidental size 1.5 slab occurred at treeline on a Northeast aspect in an open slope. The skier went for a short ride and was buried waist deep.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Thursday

Régions couvertes