Boletín de aludes

Banff Yoho Kootenay

Mar 28 – 29, 2015Parks Canada
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Archivado · caducó 12 years ago

Peligro de aludes

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

The amount of overnight freeze and solar input will be key to the danger ratings Sunday. If it does not freeze, danger ratings will be higher than listed, especially at treeline and below. SH

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    There is generally 10-20 cm available for transport and moderate to strong SW wind continues to build windslabs. With a good freeze Sunday these will become less sensitive, but will be found in immediate lees or ridge crests.

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    Avalanche activity will depend upon overnight freeze and solar input Sunday. There is a lot of heat and moisture in the lower elevation snowpack.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–3
    The lower half of the snowpack is weak due to the presence of basal facets and depth hoar. Loose wet avalanches could initiate these deeper layers.

Weather Forecast

Freezing levels are forecast to drop to valley bottom Sunday morning, with afternoon freezing levels to 2100m.  The Banff/Sunshine region could see sunny periods, and the Northern regions should be mostly cloudy.  Moderate to Strong W winds Sunday and trace amounts of precipitation.

Snowpack Summary

Rain below 2000-2200m Saturday. Up to 15cm high density snow amounts in the alpine Saturday. Treeline elevations are taking the brunt of the heat/rain as some areas below treeline are below threshold and the alpine stayed at or below freezing.  The mid pack at treeline and above still has weaker basal facets and depth hoar as a concern.

Avalanche Summary

Many loose wet avalanches to size 2 at treeline and below were noted Saturday through the forecast region due to Friday's heat, and Saturday's rain. 

Confidence

Freezing levels are uncertain on Sunday

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