Bulletin d’avalanche

South Rockies

Dec 4 – 5, 2012Avalanche Canada
Voir sur la carte
Archivé · expiré 14 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
1 · Faible
Ouvrir la carte complète

Points saillants

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    Forecast snowfall and extreme winds will create new wind slabs and potentially add to the size and reactivity of existing storm slabs. With high wind values, loading may take place lower on the slope than normal.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–5
    We have not heard of any new releases on this early season rain crust; however, an avalanche at this interface could be surprisingly large and destructive. This layer may become reactive with warming and/or increased loading.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

Overnight and Wednesday: Light to locally moderate snowfall overnight, easing off by Wednesday morning / Strong to extreme southwest winds / Freezing level at 1600m overnight dropping to surface by Wednesday morning Thursday: Light snowfall / Moderate west winds / Freezing level at 900mFriday: Possibility of clearing / Light southwest winds / Freezing level at surface

Avalanche Summary

Several size 1-1.5 soft slabs were ski cut in the Westcastle area on Monday. They occurred with the recent storm snow on north to northeast facing terrain between 1900 and 2200m.

Snowpack Summary

Recent storm accumulations have been highly variable throughout the region with some reports from the east side of the region indicating storm slabs up to 40cm deep. Warmer temperatures at lower elevations have created moist surfaces that will most likely form a temperature crust with dropping freezing levels. Ongoing light to locally moderate snowfall and strong to extreme winds will create pockets of windslab at treeline and above.The November crust was found to be buried down about 60 cms and was associated with a layer of facets either directly above or below. In general, snowpack data is sparse in this region and significant variations likely exist from one drainage to another. Digging down and making your own observations will be critical to safe slope selection. Any observations from the field are welcome at [email protected].

Régions couvertes