Boletín de aludes

Banff Yoho Kootenay

Feb 28 – Mar 1, 2019Parks Canada
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Archivado · caducó 8 years ago

Peligro de aludes

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

The surface snow is so unconsolidated that almost all steep slopes will sluff. If the terrain is long & steep enough (couloirs, gullies) then prepare to manage a mass snow flowing around you. There's great skiing on  wind sheltered slopes!

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely
    Tamaño
    1–2
    We expect a few lingering windslabs, but for the most part these slabs are old and are likely only to be found in very steep or extreme terrain near wind exposed ridge crests. Pay close attention to the feeling of the surface snow under your feet.

  • Loose Dry

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–1.5
    A sustained period of cold weather has created weak, dry, faceted surface snow. In steep terrain, these facets are easily triggered and can quickly gain enough mass to affect skiers and climbers, especially in gullies.

Weather Forecast

Another day of slightly warmer daytime highs (~-7C) on Thursday before we slide back into the deep freeze on Friday with a trace of snow possible.  The arctic air will continue to prevail for the next several days with no snow in the forecast.

Snowpack Summary

The snowpack is stable, but with each passing day it becomes weaker and more unconsolidated as the cold temperatures facet the surface layers. Surface conditions are a mix of wind effect or 30 cm of  very loose facets sitting over an old layer of surface hoar & crust (Jan 17) down 40-60 cm. Snowpack tests show hard, resistent shears on this layer.

Avalanche Summary

No new avalanche activity observed or reported today. Recent reports have noted small wind slabs being triggered in the alpine and loose dry avalanches releasing in steep terrain at all elevations. The faceted surface can easily entrain mass, and sweep you off your feet!

Confidence

Due to the number and quality of field observations

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