Boletín de aludes

Banff Yoho Kootenay

Apr 15 – 16, 2015Parks Canada
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Archivado · caducó 11 years ago

Peligro de aludes

Fri
Sat
Alta montaña
Sin grado
Límite del bosque
Sin grado
Bajo el límite
Sin grado
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Lo esencial

A beautiful day in the mountains, and strong winds aloft kept the snow surface mostly cool except in sheltered, south facing areas. Next few days - classic SPRING conditions. Start early and finish early as we transition into melt/freeze conditions.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–2
    Windslabs exist in many open areas at treeline and above, and expect to see these avalanche during the warm afternoons as the sun effects the snow surface. Watch out for all windloaded rolls.

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–3
    Another large cornice fall was observed on Wednesday, triggering a size 3 deep slab. The deep facets at the base of the snowpack appear to be waking up with large triggers.

Weather Forecast

A strong ridge of high pressure is settling into the region and the next 5 days look to be sunny and warm. Spring is here! Expect highs over the next few days between 5 and 10 degrees, and freezing levels will hit 2300m on Friday. Winds will generally be light at treeline, but will continue to smoke along between 35-60 km/hr at high elevations.

Snowpack Summary

Last 5 days of storm snow totalled 35cm at Bow Summit, 49 cm at Lake Louise and 32cm at Sunshine. Strong winds have blown this snow into windslabs at treeline and above, and now the solar influence will weaken the snowpack structure in the afternoon. Cornices are a major concern (see avalanche activity) and seem to be waking up the deep facets.

Avalanche Summary

A large (size 3) slab avalanche triggered by a cornice fall was observed on the Simpson Ridge, beyond the Sunshine backcountry. Also, a pair of skiers triggered a size 2 avalanche on the obviously windloaded roll to the north of Quartz Ridge - this one could have been predicted as that is a fat, convex roll. Generally the wind kept the snow cool.

Confidence

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