Bulletin d’avalanche

Cariboos

Feb 11 – 12, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Wed
Thu
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–4
    Wind slabs continue to be a concern on lee slopes and behind terrain features like ridges and ribs. They could be triggered under the weight of a person. Looming cornices may threaten slopes below.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–5
    A persistent weak layer of surface hoar, crusts and/or facets lurks around 80 cm deep. This weakness may be reactive to human triggers and can be difficult to predict.

Confidence

Fair - Timing of incoming weather is uncertain

Weather Forecast

Tuesday: A frontal system approaches the coast and moves across the province. Flurries are expected during the day (2-3 cm) and moderate snow in the evening and overnight (~10 cm). Winds increase to strong from the southwest later in the afternoon. The freezing level is around 1200 m. Wednesday: Possible flurries early then a mix of sun and cloud. The freezing level drops to 500 m. Winds are light from the northwest. Thursday: A mix of sun and cloud. The freezing level is near valley bottom. Winds are light from the west.

Avalanche Summary

A few natural cornice releases were reported in the region on the weekend. The failing cornices did not release slab avalanches. There were also reports of loose snow avalanches up to size 2 on steep solar aspects on Sunday.

Snowpack Summary

The snow surface consists of soft wind slab in exposed alpine terrain, sun crust on solar aspects, and surface hoar or facets on shady slopes. Below this up to 40 cm of settled storm snow sits on old wind slabs and recently buried weak layers. The late January surface hoar, sun crust, and/or facet layer is down around 80 cm deep and remains a concern for triggering. Use extra caution on large open slopes, cutblocks and convex rolls at and below treeline where the buried surface hoar may be preserved.Cornices are reported to be large throughout the region. The mid-pack is generally well settled and strong and the average snowpack depth at treeline elevations is near 200 cm.

Régions couvertes