Bulletin d’avalanche

South Rockies

Dec 28 – 29, 2011Avalanche Canada
Voir sur la carte
Archivé · expiré 15 years ago

Danger d’avalanche

Fri
Sat
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
Ouvrir la carte complète

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    Wind slabs can be found on North-Southeast aspects. Cross-loading is possible on open slopes oriented parallel to the wind. You may find wind slabs further down the slope or on open wind exposed areas below treeline.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–6
    More of an issue in the northern parts of the region where the snowpack is deeper. The mid-December surface hoar layer was destroyed in wind exposed areas. I'd be suspicious of sheltered treeline locations where it may be more preserved.

Confidence

Fair - Intensity of incoming weather is uncertain on Friday

Weather Forecast

Overnight Wednesday: Snow amounts 5-8cms. Winds 40-50km/hr from the SW. Thursday: A ridge of high pressure will likely build. This will bring dryer conditions with sunny breaks. Extreme Southerly winds expected. Friday: Light snow amounts 5-10cms. Winds will be moderate from the southwest. A light Chinook will rise freezing levels above zero in the valley.

Avalanche Summary

Some natural low density sluffing in steep, rocky terrain features. Cornice fall on N-NE aspects initiating avalanches up to size 2.

Snowpack Summary

Strong westerly winds and warmer temperatures continue forming wind slabs on lee locations. Windward aspects are being stripped, and scoured in the alpine and open treeline. A buried layer of surface hoar lies approximately 20 cm below the snow surface. This layer is not widespread; it's quite spotty through the region. This layer may be found in isolated, sheltered locations at and below treeline. The total snowpack depth around 1800m is 70cm. We're still dealing with a variable thin snowpack. Thin spot triggering down to the basal facets and depth hoar is still a concern. A well settled mid pack bridges over the basal weaknesses at the ground in thicker snowpack areas.

Régions couvertes