Boletín de aludes

South Columbia

Feb 21 – 22, 2015Avalanche Canada
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Archivado · caducó 12 years ago

Peligro de aludes

Mon
Tue
Alta montaña
2 · Moderado
Límite del bosque
1 · Débil
Bajo el límite
1 · Débil
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Lo esencial

Keep an eye on the temperatures over the next few days. Solar radiation and rising freezing levels can weaken the snowpack and make destructive avalanches more likely.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–3
    Gusty northwest winds are expected to redistribute recent accumulations into fresh wind slabs in higher elevation terrain. Due to the anomalous wind pattern, wind slabs may be found in unsuspecting locations.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely
    Tamaño
    3–6
    Persistent weak layers have been less reactive as of late. I'd be increasingly cautious in steep, unsupported terrain and watch my overhead hazard, especially with daytime warming.

Confidence

Good

Weather Forecast

Mainly sunny skies will persist throughout the forecast period as the dry ridge continues to occupy our province. Daytime freezing levels should hover around 1500m for each day, although an inversion is possible on Tuesday. Winds will remain generally light to moderate from the northwest.

Avalanche Summary

Avalanche activity has gradually tapered off throughout the week. On Thursday there were a couple reports of natural cornice falls, but these did not trigger slabs. There were also a few reports of size 1 skier controlled wind slabs from East facing slopes. These were typically around 20 cm deep. Recently developed wind slabs could remain sensitive to rider triggering throughout the weekend.

Snowpack Summary

Up to 10 cm of recent snow covers the previous variable snow surface of surface hoar, crusts, dry facetted snow, or wind affected snow depending on aspect and elevation. The "Valentine's Day" crust is just below the surface and is now strong and thick in most places. New wind slabs may have formed in lee terrain from recent W-NW winds, and cornices remain large and weak. The late-Jan crust/surface hoar layer (up to 100 cm deep) and the mid-January surface hoar (80-120 cm deep) continue to give variable results in snowpack tests. Chances of triggering these weaknesses have decreased, but triggering may be possible from thin or rocky snowpack areas; or perhaps with a cornice fall, or an avalanche stepping down, especially on sun drenched slopes.

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