Bulletin d’avalanche

Jasper

Dec 25 – 26, 2014Parks Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Tiny Tim and the Ghost of Christmas Past found good turns on Hilda Ridge, Merry Christmas one and all.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Wind loading producing  soft slabs on lee features at and above treeline. A field team on the 24th found a generally stable snowpack with hard and moderate shears in the upper snowpack at  alpine elevations. Good skiing in sheltered spots.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    This weak layer exists below a strong mid-pack at treeline and sub-alpine elevations. Surface slides or cornice collapse could trigger this deep persistent weakness.

Weather Forecast

No significant snowfall is forecast until the weekend when up to 10cm may arrive in the Icefields area. Temperatures will drop over Christmas with overnight lows in the low teens but warming during the day. Over the next 24 hours winds will remain light from the West and at upper elevations NW. Over the weekend these are forecast to increase.

Snowpack Summary

Wind slab forming on lee alpine ridge lines. Large surface hoar crystals formed last week are being buried by new snow. This layer is more likely to be found on sheltered slopes at tree line and below.  The interface between the strong mid-pack and weaker basal facets is most susceptible to human triggering from shallow rocky areas. 

Avalanche Summary

Three new avalanches were recorded in the Columbia  Icefields area. The events were  size 2 thin storm slabs and class 1.5 point releases from steep slab alpine terrain. 

Confidence

The weather pattern is stable

Régions couvertes