Bulletin d’avalanche

Purcells

Jan 6 – 7, 2015Avalanche Canada
Voir sur la carte
Archivé · expiré 12 years ago

Danger d’avalanche

Thu
Fri
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
Ouvrir la carte complète

Points saillants

High avalanche danger is expected to continue for another day due to new storm slabs, high freezing levels, and above freezing air trapped in the alpine.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    2–5
    The new storm slab will add to the load above the mid-December persistent weak layer. This may not be enough load to trigger naturally, but may increase propagation distance and the likelihood of remote triggering.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely - Very Likely
    Taille
    1–4
    The new storm slab is expected to continue to release naturally or be very easy to trigger with light additional loads like a skier or rider.

Confidence

Poor - Freezing levels are uncertain

Weather Forecast

Expect a lot of variability in this region due to the warm air from the West-Northwest meeting the cold arctic air from the Rockies. The West and South should be very warm with moderate Westerly winds, and the North and East should stay cooler with light Northeast winds. Freezing levels will vary on Wednesday as the storm ends and warm air tries to push East. Mostly clear on Thursday with cooler (alpine temperatures around -10) and drier conditions. Friday mostly clear with light winds and no precipitation.

Avalanche Summary

Natural and skier triggered avalanches up to size 2.0 releasing down 30-50 cm in the new storm slab.

Snowpack Summary

There is a great deal of variability across the region. The West and South have received up to 60 cm of storm snow in the past 48 hours, quickly followed by high freezing levels and warm air up into the alpine. The North and East of the region have had 20-30 cm of cold dry new snow over the past 48 hours with light Northeast winds. This new slab may be sitting on a patchy layer of surface hoar that was buried near the end of December. Deeper in the snowpack there is a persistent weak layer of surface hoar and crust that is now down about 60 cm.

Régions couvertes