Boletín de aludes

Northwest Inland

Apr 13 – 14, 2015Avalanche Canada
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Archivado · caducó 11 years ago

Peligro de aludes

Wed
Thu
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Lo esencial

Localized solar radiation, snow amounts and wind values may be higher than forecast. Use a conservative approach and watch for signs of instabilities like natural avalanche activity.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    Strong winds have built wind slabs in lee terrain in the alpine and at treeline. They are especially touchy where they sit on buried facets, surface hoar and/ or crusts. Use caution and watch for reverse loaded slopes from changing winds.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–5
    Additional 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 and destructive avalanches.

Confidence

Fair - Due to the number of field observations

Weather Forecast

Winter continues in the North as another intense storm moves onto the coast tonight resulting in very strong winds and light precipitation amounts. Very unstable air will result in unsettled conditions on Tuesday where localized light-moderate precipitation is possible ( 5-15 mm) accompanied by strong west winds and freezing levels near 1200 m. On Wednesday, precipitation amounts could see up to another 10 mm, freezing levels and winds consistent with Tuesday. There will be a lull in the weather pattern Thursday before things redevelop on Friday as another storm tracks across northern BC.

Avalanche Summary

No reports of natural avalanche activity yesterday. With continued precipitation, localized solar radiation and strong winds new storm slabs and winds slabs will likely be touchy on Tuesday. Natural and human triggered avalanches up to size 2 are expected.

Snowpack Summary

What new snow we have received has been blown into wind slabs on exposed lee slopes. The main concerns right now are wind slabs over a variety of surfaces that include crusts, facets and surface hoar that formed in in sheltered places during the last spell of clear cool weather. Large ripe cornices are also of concern and will be a problem with additional loading, especially when the sun and warm temperatures come back. The March 25th crust with facets appears to be inactive, but is worthkeeping on the radar with forecast snow and wind.

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