Bulletin d’avalanche

South Columbia

Jan 18 – 19, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Sun
Mon
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
    Taille
    1–4
    Wind slabs may be found behind terrain breaks such as ridges and ribs. It may be possible for a wind slab to step down to a deeper instability.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–5
    Triggering persistent slabs is becoming less likely, but a cautious approach to steep south-facing slopes and sheltered terrain below treeline is still advised.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

Saturday: Moderate W winds. Alpine temperature near -2. No snow.Sunday: Light to moderate W winds. Alpine temperature near -2. No snow.Monday: Light SW winds. Alpine temperature near -2. No snow.

Avalanche Summary

A couple of large glide slab releases have been observed. Otherwise, no new avalanches have been reported.

Snowpack Summary

Strong NW through SW winds have left wind slabs in many areas, even at treeline. These are likely to be gaining strength as time goes on and the amount of snow available for transport diminishes. Around 40-60 cm settled storm snow sits above surface hoar (found especially at and below treeline in sheltered areas), a sun crust (on steep S to SW -facing slopes) and facets. The distribution of these weaknesses is patchy, but where they exist, it may still be possible to trigger a large avalanche with the weight of a person or snowmobile. Test results on these interfaces vary from no result to moderate, sudden results. A strong mid-pack overlies a weak facet/crust layer near the base of the snowpack, which is generally considered inactive.

Régions couvertes