Bulletin d’avalanche

South Rockies

Feb 21 – 22, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Sat
Sun
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

New snow and strong winds will rapidly raise avalanche danger with the onset of a winter storm on Friday.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    2–5
    Loading from new snow and wind will rapidly increase avalanche danger, particularly in exposed lee areas, where significant wind slab deposits are expected to develop.

Confidence

Poor - Timing, track, or intensity of incoming weather is uncertain

Weather Forecast

Synopsis: An intense storm will impact the region on Friday afternoon/evening, then briefly clearing on Saturday before another storm hits later on Sunday.Friday: 10-15 cm new snow is expected, starting in the afternoon. Strong southwesterly winds becoming gusty northwesterly to 90 km/h at ridgetop. Freezing level 1600 m.Saturday: Light snow in the morning, dry in the afternoon. Winds becoming light northwesterly. Freezing level 1000 m.

Avalanche Summary

Small soft slab avalanche could be skier-triggered on Thursday. Loose snow avalanches have also been reported in the recent new snow.

Snowpack Summary

Southeastern parts of the region have seen 30-60cm new snow in the last few days, while western areas have seen more like 10-20 cm. Mostly this snow has been light and overlies old wind slabs on higher north and east facing terrain and sun crusts on solar aspects. There may be localized areas where the wind has blown the new snow into isolated wind slabs in exposed areas. A surface hoar/facet/sun crust layer from mid February (12th) may be buried in the top 35 cm or so, but has not been widely reported from this region. Mid and lower snowpack layers are generally well settled and stable.

Régions couvertes