Boletín de aludes

Purcells

Jan 22 – 23, 2013Avalanche Canada
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Archivado · caducó 14 years ago

Peligro de aludes

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

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–4
    New windslabs will form where forecasted snow accumulates on lee side of the strong SW-W winds in alpine and at treeline.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    2–5
    A cautious approach is recommended on steep S slopes and sheltered terrain below treeline.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain on Wednesday

Weather Forecast

Tuesday night and Wednesday: The frontal system is pushing its way into the interior and precipitation should start later Wednesday. Between 5 to 10 mm is expected to fall during the day with moderate to strong winds from the SW in the alpine. Freezing levels will lower to valley bottom and the inversion will disappear. Thursday: A break before the next system. Expecting some clearing, winds tapering off staying from the W, temperatures also staying cool and freezing level to valley bottom.Friday: Expecting light precipitation and moderate SW winds.

Avalanche Summary

A few loose avalanches up to size 2 were reported on steep S-SE facing slopes.

Snowpack Summary

The new snow will fall on a variety of surfaces; windslabs in the alpine, facets, surface hoar below treeline in sheltered areas and a suncrust on South facing slopes.  New windslabs and some sluffing in sheltered terrain is expected.  These new layers will most likely be touchy for a certain time.The surface hoar layer below the 40-60 cm of generally well settled snow is still a concern to professionals, especially below 1900 m. in sheltered-shady areas and on S aspects. It still produces sudden planar shears in those areas as well as some resistant planars.  A strong mid-pack overlies a weak facet/crust layer near the base of the snowpack, which is now considered inactive.

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