Boletín de aludes

Northwest Coastal

Apr 14 – 15, 2015Avalanche Canada
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Archivado · caducó 11 years ago

Peligro de aludes

Thu
Fri
Alta montaña
4 · Fuerte
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Lo esencial

Tricky winter conditions exist at higher elevations. Localized solar radiation, snow amounts and wind values may be higher than forecast. Avoid avalanche terrain during periods of heavy loading by snow, rain and wind.

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–5
    Additional storm snow loading on the mid- March persistent weak layer could bring it back to life. Smaller storm slab avalanches may step down to this layer, initiating large, destructive avalanches.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely - Very Likely
    Tamaño
    1–4
    Storm slabs are touchy, especially where they sit on a buried facet, surface hoar and/ or crust interface. Strong winds have built wind slabs on leeward slopes and behind terrain features. Use caution and watch for reverse loaded slopes.

Confidence

Fair - Due to the number of field observations

Weather Forecast

The current weather pattern is more winteresque than it has been all season. Im beginning to feel seasonally confused. The lull before the storm is over, and the next one arrives in coastal and inland regions late tonight. Wednesday will be fairly stormy with precipitation amounts 15-25 mm. Ridgetop winds will be strong from the SW and freezing levels will hover near 1100 m. On Thursday, 5-10 mm of precipitation is expected with continued strong west winds and freezing levels near 1000 m. The next bulk of precipitation comes Friday and hits mainly the coastal areas (around Terrace and west) with precipitation amounts up to 25 mm. Ridgetop winds will be moderate from the SW and freezing levels will rise to 1500 m. A strong upper level ridge looks to set up over the province through the weekend and remain stationary until Tuesday bringing warm air and clear, sunny skies.

Avalanche Summary

On Monday, explosive control showed numerous storm slab and wind slab avalanches up to size 2. These were primarily from N-NW aspects above 1300 m. With continued snow, rain, and strong winds natural avalanches and human triggered avalanches will likely continue on Wednesday. Lower elevations which have become rain soaked may see natural loose wet avalanches.

Snowpack Summary

At upper elevations 25- 40 cm of recent storm snow has blanketed the region. The new snow has been redistributed by strong south-west winds into wind slabs on leeward slopes and terrain features. With recent changing winds from the NE, you may find some reverse loaded pockets in unsuspecting places. The lack of bond between the new wind slabs and storm slabs over the older snow surfaces buried on April 9 th (surface hoar, crusts and facets) is the primary concern. The March 25th surface hoar / crust layer is reportedly unreactive, however; with the new load of wind and snow this should remain on your radar as it may re-awaken, initiating very-large and destructive avalanches. Moist- rain soaked snow exists at lower elevations.

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