Bulletin d’avalanche

Northwest Coastal

Dec 30 – 31, 2014Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

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

Confidence is poor due to wildly variable wind slabs and a forecasted Above Freezing Layer that suggests we may not get a refreeze between 1500m and 2800m until Thursday morning.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Outflow winds left the biggest wind slabs on south facing features, but slabs of varying thickness/hardness will likely be found on all wind exposed slopes.

Confidence

Poor

Weather Forecast

Synopsis: Arctic air is now dominant over all of coastal BC. Warmer air riding up and over the arctic air has created an above freezing layer that should stick around through Thursday morning. Looks like a significant storm will make landfall Thursday night continuing into Friday.Wednesday: Freezing Level: Valley Bottom, potential AFL 1000 to 2500m; Precipitation: Nil; Wind: Treeline: Moderate, NW | Ridgetop: Strong, NW.Thursday: Freezing Level: 800m, Precipitation: trace; Wind: Treeline: Moderate W/SW | Ridgetop: Extreme, SW.Thursday Night: Precipitation: 10 to 25mm | 10 to 30cm.Friday: Freezing Level: 800m; Precipitation: 5 to15mm | 5 to 20cm; Wind: Treeline: Strong, SW | Ridgetop: Extreme, W

Avalanche Summary

On Tuesday wind and storm slabs to size 2.5 ran on NW, SW and SE facing aspects between 1500 and 2000m

Snowpack Summary

Strong outflow winds on Dec. 28 left a variety of wind affected conditions in their wake in wind exposed terrain at all elevations. You will likely find wind pressed snow on north aspects, thicker wind slabs on south facing features and some degree of crossloading on everything else.The mid and lower snowpack are generally well-settled. Several old crust layers exist but these appear to be well bonded.Look for a revised snowpack discussion on Wednesday.

Régions couvertes