Boletín de aludes

Banff Yoho Kootenay

Feb 7 – 8, 2015Parks Canada
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Archivado · caducó 12 years ago

Peligro de aludes

Sat
Sun
Alta montaña
4 · Fuerte
Límite del bosque
4 · Fuerte
Bajo el límite
3 · Notable
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Lo esencial

High freezing levels & precipitation with strong winds aloft are telltale signs that avalanche terrain is best avoided this weekend until the storm ends and temperatures cool things off. Avoid any avalanche terrain and make simple terrain choices. PJ

Problemas de aludes

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Very Likely
    Tamaño
    1–3
    Storm slabs are the primary issue in the upper snowpack and failures will be occurring both within the colder low density and on the January 30th crust interface. This problem will be most prominent in the alpine and treeline bands on all aspects.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    2–4
    The base of the snowpack remains weak due to basal depth hoar/facets. Additional snow load, or a storm slab failure may trigger large to very large avalanches in thin snowpack areas. There were additional avalanches triggered on these facets today.

Weather Forecast

The Jet Stream is lined up in a north westerly flow on the east side of the Divide coupled with strong SW flow from the southern Pacific providing a positive moisture feed until Saturday afternoon with light snow through Sunday. The winds aloft will remain strong until Saturday evening. A break in the weather is expected by Monday morning.

Snowpack Summary

45 - 70 cm of recent storm overlies a crust from January 30th. The recent heavy precipitation, wind and warmer temperatures have created storm slabs which will put an enormous amount of stress on the January 30th crust interface. The basal facets from Nov 6th could reemerge in step down events with this huge stress to the snowpack.

Avalanche Summary

One natural size 2.5 avalanche narrowly missed a number of snow-shoers today in Lake O'Hara out the Schaeffer Bowl area. Several large avalanches up to size 3 were observed on the Highway 93S. Poor weather and embedded fog limited the forecaster's observations today but there were undoubtedly many more avalanches occurring than were seen today.

Confidence

Forecast snowfall amounts are uncertain on Saturday

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