Bulletin d’avalanche

Jasper

Nov 22 – 23, 2015Parks Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

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

Excellent skiing and supportive touring in sheltered areas. Early season hazards are cleverly hidden under all the snow. Ski and ride cautiously.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    Consistent strong to moderate winds have been forming wind slabs on cross-loaded and lee aspect slopes. With little left to transport, existing slabs will stiffen; facetting will weaken the base of support and they may become more easily triggered.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    50-70 cm of unconsolidated snow is sitting on steep terrain. Expect point releases from cliffs and steep smooth surfaces. Wind, sun and other triggers could release this snow and be enough mass to bury a person or push an ice climber off.

Weather Forecast

Expect seasonal temperatures next few days with a slight daytime warming trend continuing Sunday. Consistent moderate westerly winds continue through Sunday making it unpleasant to tour in the open. Monday afternoon forecast still calling for 10-15 cm of storm snow. Be observant of the impacts of previous wind and the resulting stiffening slab.

Snowpack Summary

Field observations in the Parkers area found snow depths vary between 10 to 140 cm. Extensive wind effect at TL and above giving supportive touring but limited ski quality out in the open. Where significant loading has occurred the snow remains stubborn and does not want to propagate. This was the case on a heavily cross-loaded open west aspect.

Avalanche Summary

One possible unobserved skier remote, sz 1.5 seen today on a regular performing slope in the Hilda-Destiny ridge area. A BTL steep rock slab feature in a cross-loaded gully. Forecasters are treating it as a anomalous event as no further evidence in the surrounding area supports that snowpack character but, still a high consequence event.

Confidence

Due to the quality of field observations

Régions couvertes