Bulletin d’avalanche

Northwest Coastal

Apr 10 – 11, 2017Avalanche Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

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

Cornices remain the primary concern. Solar radiation is a common cornice trigger. Limit your exposure when it's cloudy and completely avoid cornices when it's sunny.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Small amounts of new snow and moderate southerly winds may have formed thin wind slabs in lee features below ridgetops.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    Large cornices may become weak with daytime warming and have the potential to trigger slabs on the slopes below.

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

Unsettled weather and cool temperatures continue throughout the forecast period.TUESDAY: Cloudy with scattered flurries (5-10cm). Light southeast ridgetop winds. Freezing level around 1200 m.WEDNESDAY: Mix of sun and cloud with isolated flurries (0-5cm). Strong easterly ridgetop winds. Freezing level around 1500 m.THURSDAY: Mainly cloudy with isolated flurries (2-5cm). Moderate southeasterly ridgetop winds. Freezing level around 1400 m.

Avalanche Summary

On Sunday, several Size 2 wet slabs were triggered with explosives control work in the north of the region. Loose wet avalanches to Size 2 were also reported running naturally on solar (south facing) aspects.

Snowpack Summary

Small amounts of new snow (up to 10cm) fell in the past few days with light to moderate southerly winds. The new snow will likely be sitting on hard surfaces created by strong winds last week, or melt-freeze crusts below 1400m.Sunny breaks and warmer temperatures on Monday has likely left a supportive temperature crust on all aspects up to treeline. North facing alpine slopes reportedly have up to 10cm dry powder, on a firm crust. A weak layer of facets and crusts from late February are buried 100-120 cm down. The layer has been unreactive recently and has a variable distribution. That said, rapid warming of the snowpack or a large trigger, such as a cornice, may still have the potential to trigger it.

Régions couvertes