Boletín de aludes

Banff Yoho Kootenay

Apr 14 – 15, 2019Parks Canada
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Archivado · caducó 7 years ago

Peligro de aludes

Tue
Wed
Alta montaña
Sin grado
Límite del bosque
Sin grado
Bajo el límite
Sin grado
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Lo esencial

It is still very much winter up high. Storm snow and steady wind over the weekend has created wind-slabs in the alpine. Step back from skiing exposed and committing lines in the alpine until the wind-slabs have settled out.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–1.5
    Recent storm snow (20-50cm) has been redistributed by steady and moderate Westerly wind over the weekend. Some drifts in immediate lees are 100cm deep. Poor visibility has limited specific windslab observations as of Sun afternoon.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely
    Tamaño
    1–2
    These slabs remain a concern on north aspects in the alpine where March winds built slabs over the facetted snow from February's cold snap. Additionally, there is uncertainty as to how this layer will react with the recent storm snow load.

  • Loose Dry

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–1.5
    Recent storm snow has been producing loose dry avalanches from steep terrain. They are small in size and are not running particularly far.

Weather Forecast

Temperatures will remain relatively cool (-5 to -10), even in the valley (4 to -5), for the next few days. Snowfall is supposed to taper off. Convective flurries in localized areas will still be occurring however. The wind will subside to the light range (SW) today and stay there for 48 hours or so.

Snowpack Summary

20 to 50cm has fallen at higher elevations since April 9. The new snow and wind is creating windslabs on lee N and E aspects, some up to 100cm deep in immediate lees in the alpine. Facets 50 to 70cm deep produce hard shears but have not produced an avalanche for a while.

Avalanche Summary

A few small windslabs (size 1) were noted in isolated areas throughout the park today, however visibility was limited. Additionally several dry loose avalanches were observed in steep terrain in the alpine to size 1.

Confidence

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