Boletín de aludes

Northwest Coastal

Mar 26 – 27, 2013Avalanche Canada
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Archivado · caducó 14 years ago

Peligro de aludes

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

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–4
    Watch for wind slabs behind ridges and ribs and in cross-loaded gullies. Cornices are also large and untrustworthy, especially on hot days.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    2–7
    A layer of surface hoar buried down 50 cm was especially touchy last week. While the likelihood of triggering is slowly dropping, it can be triggered from a distance, propagate across large distances and create surprisingly large avalanches.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

Wednesday:Very light snow. Light to moderate SW winds. Alpine temperature near -4.Thursday/Friday: No snow expected. Mainly sunny. Freezing levels around 1500 m by day and dropping by night.

Avalanche Summary

A few naturally-triggered wind slabs and loose moist avalanches have been observed over the last couple of days. Ice fall also triggered size 2.5-3 avalanches near Bear Pass and other areas. On Saturday there was a report of a size 2 avalanche, triggered from a distance by a snowmobile. This slide probably failed on the March 9 surface hoar, which was responsible for a lot of remotely-triggered avalanche activity last week.

Snowpack Summary

Recent new snow is settling with the influence of warm temperatures. Wind slabs may be found at alpine and treeline elevations on many slope aspects due to variable winds. A layer of surface hoar (buried March 9th; now down about 40-60 cm) is slowly becoming less touchy, but professionals are keeping a wary eye on it. In some places this interface is a crust/facet layer. Triggering this layer is becoming a low probability but high consequence problem. Check out the Forecaster's Blog for related discussion. A second surface hoar layer, buried on March 18, is also reported to be gaining strength. The mid snowpack is generally well settled and strong. Cornices are large and untrustworthy, especially when the sun is out.

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