Boletín de aludes

Banff Yoho Kootenay

Dec 11 – 12, 2018Parks Canada
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Archivado · caducó 8 years ago

Peligro de aludes

Wed
Thu
Alta montaña
2 · Moderado
Límite del bosque
1 · Débil
Bajo el límite
1 · Débil
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Lo esencial

A storm is coming, but most of the precip is coming later in the day Tuesday, so not much change until Wednesday. This new snow will be great for ski conditions, but will make for touchy avalanche conditions as it lands on a weak base

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–1.5
    These are getting quite old but are up to 40 cm deep in the immediate lees of alpine features. Although small in size, these slabs can provide the push to get the deep persistent slab problem initiated.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1.5–2
    It is still possible to trigger this layer but it will be in isolated, steep spots and often adjacent to thin rocky areas. Be cautious in steep terrain where a stiffer, more cohesive slab exists over the weak faceted snow at the base of the snowpack.

Weather Forecast

Finally, snow is in the forecast!  We should see light snow starting on Tuesday with only small accumulations ~ 5cms. An additional 10-15 cms by Wednesday PM and up to 40 cms by Thursday. The greatest amounts will be west of the divide. Temperatures should remain cold throughout, but winds will be strong W/SW with the highest on Tuesday and Thurs

Snowpack Summary

A cm or two of new snow is covering up widespread surface hoar and facets in most places. In exposed alpine areas, old wind slabs 10-40 cm deep linger in immediate lees. The October 26th crust/facet layer is ~30 cm above ground. In many areas the entire snowpack is faceting and becoming quite weak. Snow depths range from 50-85 cm at 2000 m.

Avalanche Summary

No new avalanches reported or observed today, but as recently as Saturday someone triggered a nasty looking size 2 on the SE slopes of Cirque Fore-Peak at 2700m above Helen Lake. Two skiers were caught on the flanks of a slab 20-40cm deep, 80m wide, running up to 250m with no burial but they some lost equipment.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

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