Bulletin d’avalanche

Cariboos

Apr 10 – 11, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–5
    Large cornices exist in alpine terrain and they may pop off with warmer temperatures and intense solar radiation. A failure could be destructive by itself, and could also trigger an avalanche on the slope below.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–4
    Loose wet avalanches are likely on sun exposed slopes during the day. It's possible that loose slides could initiate something deeper in the snowpack.

  • Wet Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–6
    Wet slabs become more likely during periods of prolonged warm temperatures and/or sunshine.

Confidence

Fair - Timing or intensity of solar radiation is uncertain on Wednesday

Weather Forecast

Wednesday: increased cloud with light precipitation developing in the late afternoon becoming moderate in some areas overnight / light to moderate southerly winds / freezing level at 2500m Thursday: light precipitation / moderate westerly winds / freezing level at 1700m Friday: mostly cloudy skies with trace amounts of precipitation / moderate westerly winds / freezing level at 1700m

Avalanche Summary

On Sunday, a very large (size 3) naturally-triggered avalanche was reported on an east aspect at 2700 m that initiated on the late March crust and then stepped down to glacier ice. There have also been numerous loose snow avalanches running on steep solar aspects to size 2.5.

Snowpack Summary

Melt-freeze conditions exist to about 2100m on all aspects and to ridge top on solar aspects. On shaded aspects higher up, 60 cm of recent storm snow is reported to be generally settling well with recent warm temperatures and generally light winds. However, operators are still reporting moderate, "resistant" shears within the recent storm snow. Additionally, a crust that formed near the end of March is a concern, particularly on steep, solar aspects. With prolonged warming, there is the possibility for wet slabs to release on this layer, or potentially on deeper layers (including the ground), as melt water starts to percolate through the snowpack. Cornices are large in some areas and drooping with recent warm temperatures.

Régions couvertes