Boletín de aludes

Jasper

Jan 8 – 9, 2019Parks Canada
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Archivado · caducó 8 years ago

Peligro de aludes

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

Large features without previous activity remain a concern, it is still possible to trigger very large avalanches.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–2.5
    Moderate to strong SW winds building fresh windslabs.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1.5–3.5
    The Dec. 11th layer of facets, surface hoar is buried more than a meter deep. This layer is strengthening but was active during the recent storm.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1.5–4
    The base of the snowpack is weak and facetted in shallow areas and will likely be for some time. The new snow in combination with a skier has the potential to overload this weakness.

Weather Forecast

Cool arctic air remains over the region Tuesday. This ridge of high pressure will be replaced on Wednesday by a Pacific low giving warmer temps, rising freezing levels and precipitation midweek.Tuesday: Mix of sun and cloud. Alpine Low -19C, High -12 C. Ridge wind light SW. A detailed mountain weather forecast is available from Avalanche Canada.

Snowpack Summary

Moderate SW winds building fresh windslabs at ridgetop. Up to 85cm between Jan 2-4. This overlies previous widespread wind effect from strong to extreme SW winds (many exposed areas were scoured to ground). The Dec. 11th layer persists mid-snowpack. The basal snowpack is weak in shallow areas - several recent avalanches failed on/near the ground.

Avalanche Summary

Jan 5th helicopter control produced numerous large-very large avalanches. One significant result on Sunset pk. was a very large avalanche, which buried the Parkway and destroyed 10-20 hectares of mature timber.Good visibility on this flight revealed that a natural cycle of numerous large to very large avalanches had occurred Jan 3rd and 4th.

Confidence

Regiones cubiertas