Bulletin d’avalanche

Purcells

Jan 2 – 3, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible

Points saillants

If the sun is out and it feels warm, watch for loose moist snow falling out of cliffs and steep terrain.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–3
    Watch for newly formed and buried windslabs in the lee of terrain features and on cross-loaded features. Forecast warm air at higher elevations may help windslabs to bond to the old surface.
  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    Cornices may fall off naturally during periods of warm air at higher elevations combined with solar warming.

Confidence

Fair - Timing or intensity of solar radiation is uncertain

Weather Forecast

Wednesday night and Thursday: An upper ridge persists on the region bringing dry conditions, light to moderate winds from the Western quadrant and an inversion with temperatures above the freezing level between 2000 m. and 2500 m. Friday: Traces of snow are forecasted with strong winds from the NW and dropping freezing levels to 900 m. Saturday: Similar conditions are expected with lighter winds from the SW and slightly warmer temperatures (around -4 C in the alpine).

Avalanche Summary

No new recent avalanche observations expect older dry loose avalanches from very steep terrain in the alpine.

Snowpack Summary

There is a mix of new surface hoar layers and thin light snowfalls that have buried these layers. Some wind slabs have developed as the snow has been transported into the lee of terrain features at higher elevations. These have been reported to be reactive at ridgetops but have limited propagation potential. Sun and warmth in the alpine could weaken sun exposed slopes, be careful especially where cornices could fall and act as a trigger. The mid layers of the snowpack have settled and are generally reported to be strong. Weak layers that were developed in November continue to show results in tests, but have not been reactive. Thin snowpack areas are the most likely place for deeper layers to be reactive to the additional load of a skier or rider.

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