Boletín de aludes

South Rockies

Jan 3 – 4, 2014Avalanche Canada
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Archivado · caducó 13 years ago

Peligro de aludes

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

Conditions are complex.  Choosing conservative terrain during the sunny weekend is your best bet.

Problemas de aludes

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    3–6
    An avalanche triggered in the new snow or new windslab could step down to a persistent weakness in the snowpack buried down 100 cm.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    3–5
    Windslabs are expected to keep forming on leeward slopes which could lead to natural avalanches. The storm snow in more sheltered areas will still need some time to settle and could be still touchy.

Confidence

Fair - Due to the number and quality of field observations

Weather Forecast

Tonight and Saturday: Cold front has passed through the region, leaving behind a colder NW flow with lingering moderate snowfall amounts for tonight. Expect moderate to strong NW winds with freezing level at valley bottom and temperatures around -12 C at 1500 m. Sky should be partly cloudy on Saturday.Sunday: The ridge of high pressure keeps dominating the weather pattern keeping freezing levels low, moderate winds from the NW and partly cloudy skies. Monday: Light amounts of snow is possible as an upper disturbance cross over the region.

Avalanche Summary

Poor visibility resulted in limited terrain observation. We expect some avalanche activities happened and might still be happening with loading of new snow.

Snowpack Summary

Around 45 cm of new snow fell over the region with moderate W-SW winds creating touchy storm slabs and wind slabs on leeward alpine and top of treeline elevation band. Loading will continue on E-SE slopes on Saturday as winds keep blowing during the day tomorrow from the NW. Natural avalanche activity is still possible on leeward slopes in the alpine and top of treeline because of the storm snow available for transport. The storm snow interface has produced moderate snowpack test results and deeper surface hoar weak layers have produced hard test results. The persistent weak layers of surface hoar and facet/crust down 80-100 cm are a concern to avalanche professionals since triggering a fresh windslab or stormslab could step down to these layers and create bigger problems. Areas with shallower snowpack and rocky/planar slopes have also been reported as weak due to basal facetting (sugary, non-supportive snow at the bottom of the snowpack).

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