Boletín de aludes

South Rockies

Jan 19, 2019Avalanche Canada
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Archivado · caducó 8 years ago

Peligro de aludes

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

Watch for fresh wind slabs and avoid shallow spots where triggering deeper layers is most likely.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–1.5
    New snow is gradually accumulating above weak surface hoar and/or crusts. Wind loaded slopes may have enough snow above this layer for small avalanches.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    2–3
    Deeply buried weak layers remain a concern. These layers are more easily triggered in areas where the snowpack is shallow, such as near ridges and rocky terrain.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

FRIDAY NIGHT: Scattered flurries with localized accumulations of 5 cm, strong southwest wind, alpine temperatures drop to -10 C.SATURDAY: Mostly cloudy with isolated flurries, strong to extreme west wind, freezing level climbing to 1500 m, alpine high temperatures around -3 C.SUNDAY: Mostly cloudy with flurries possible later in the day, strong west wind, freezing level climbing to 1200 m, alpine high temperatures around -6 C.MONDAY: Skies clearing throughout the day, moderate north wind, alpine high temperatures around -6 C.

Avalanche Summary

Skier traffic produced a few small (size 1) avalanches in the new snow on Thursday.The most recent reports of larger avalanches are from last weekend, when warm temperatures stressed the deeper layers in the snowpack and produced a few size 2 avalanches.

Snowpack Summary

5-15 cm of new snow is burying large surface hoar crystals and/or sun crusts, which could eventually develop into a touchy problem as snow accumulates. The most suspect terrain features will be steep slopes and rolls below 2000 m (where the largest surface hoar exists) and steep south-facing slopes in the alpine (where sun crusts exist).Large variability in snow depths still exists in the region, ranging from almost no snow to nearly 200 cm in some areas. For average snowpack areas, expect to find weak and sugary faceted snow around 50 to 100 cm deep, which extend to the ground. This weak bottom half of the snowpack has been the culprit for large avalanches in the region over the past few weeks.

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