Bulletin d’avalanche

Northwest Coastal

Apr 21 – 22, 2014Avalanche Canada
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Archivé · expiré 12 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

Avalanche danger can rise quickly with afternoon warming and solar radiation. Be aware of changing conditions and overhead hazards.For more insight into spring danger ratings, check out this blog post.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–4
    Recent strong SW winds have formed wind slabs in leeward features.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    Loose wet activity can be expected from steep features during periods of solar warming or rain.  Isolated wet slabs may be possible under the same conditions where the recent storm snow is poorly bonded to the underlying crust.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    3–7
    A deeply buried persistent weak layer still has the potential to produce very large avalanches and could be triggered by heavy triggers such as cornice falls or smaller avalanches stepping-down.

Confidence

Poor - Due to the number of field observations

Weather Forecast

Unsettled conditions are expected for Tuesday. Wednesday and most of Thursday look to be mainly dry and sunny but localized convective flurries are possible. A Pacific frontal system is expected to reach the north coast Thursday night. Tuesday: Cloudy with sunny breaks, scattered precipitation, freezing level am: 700m pm: 1000m, ridgetop wind: light variableWednesday: Mostly sunny, freezing level am: 700m pm: 1400m, ridgetop wind: light SE-SThursday: A mix of sun and cloud, freezing level am: 1400m pm: 1700m, ridgetop wind: light SE

Avalanche Summary

No new avalanches reported.  We are no longer receiving professional daily reports for the region so public observations are really appreciated right now. If you are out in the mountains, send your observations to [email protected]

Snowpack Summary

Highly variable spring conditions are being reported in the region. At lower below-treeline elevations the snowpack is typically wet and isothermal. It has not been refreezing overnight and is melting quickly. Between roughly 1000 and 1500m, the snowpack is undergoing daily melt-freeze cycles. The same conditions can be expected on sun-exposed slopes all the way to mountain-top. On higher elevation north-facing slopes, dry snow can be found. Recent strong S through W winds have scoured windward slopes and created wind slabs in leeward slopes. The early February crust/facet layer is typically down 1.5 to 2.5m. A smaller avalanche or a cornice fall may still have the potential to step down to this layer causing very large, destructive avalanches.

Régions couvertes