Bulletin d’avalanche

South Columbia

Apr 8 – 9, 2013Avalanche Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–5
    Wind slabs may be found near ridges and in gullies. The large cornices that loom over many slopes have the potential to fail and trigger avalanches.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–4
    In some areas, new snow is bonding poorly at a weak interface. Skiers have been triggering slabs remotely, mainly on north-facing slopes at alpine elevations.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Watch for loose wet avalanches and glide slabs, which may fail naturally in response to rainfall at low elevations.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain for the entire period

Weather Forecast

Tuesday: Light snow. Light W winds. Alpine temperature near -6. Wednesday: 25-35 cm snow. Strong to extreme SW winds. Alpine temperature near -3.Thursday: Light snow. Light SW wind. Alpine temperature near -4.

Avalanche Summary

An avalanche cycle of slabs up to size 3 occurred during the weekend’s storm. Many of these events were on NE-NW aspects above about 2400 m. A few skier-remote triggered slabs were also reported on Sunday. These either failed on a storm snow weakness, or on surface hoar buried below the storm snow. On sun-warmed and low elevation slopes, loose snow and glide avalanches continue to be reported.

Snowpack Summary

Recent storm snow (up to 50 cm in the far south) is sitting on a variable interface, consisting of a crust or moist snow; or a recently formed layer of surface hoar or facets, which is mainly found on high-elevation northerly aspects. In some locations the surface hoar/facet interface is touchy, with skier triggering likely. Winds have shifted storm snow into reactive slabs lee to south-easterly to south-westerly winds. Below treeline, the snow is in a spring melt-freeze regime, melting by day and freezing by night. Cornices are very large and loom as potential triggers for avalanches.

Régions couvertes