Boletín de aludes

Banff Yoho Kootenay

Jan 1 – 2, 2019Parks Canada
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Archivado · caducó 8 years ago

Peligro de aludes

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

Happy New Year! New Years day looks to be cold and windy, but by the time you've recovered from New Years Eve, we should be into another storm cycle!

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    Strong SW winds blew mid-storm on Dec. 29th creating touchy new slabs. While the cold temperatures that have followed have diminished the sensitivity of these slabs, they are still reactive with explosives in steep terrain.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1.5–2.5
    A stiff slab overlying a weak lower snowpack comprised of facets and depth hoar can be found in most areas of the region (generally central and eastern) where a shallow snowpack exists. Give this weak snowpack some time to adjust to the storm load.

Weather Forecast

A ridge will bring cold dry conditions for the first day of 2019, and an incoming system will bring strong NW winds in the alpine. Fortunately, this system will also bring snow on Wednesday/Thursday. Precipitation amounts will start light, but forecasts are calling for 20-30 cm on Thursday, with the greatest amounts to the west and north.

Snowpack Summary

Wind effect exists in the alpine and at treeline. Below treeline, the surface is faceted powder. This overlies the Dec. 10th layer of facets and depth hoar which is down 60-100 cm. In thin snowpack areas, the Dec. 10th layer is mixed in with the basal facets and October crust. In thicker areas, it is a distinct layer, with a stronger snowpack below

Avalanche Summary

No new avalanches observed on a field trip on the Icefields Parkway today, but good visibility highlighted more naturally triggered avalanches up to size 2.5 out of steep alpine terrain from the storm on Dec. 29th. These seemed to be on all aspects, and running on the Dec. 10th layer and stepping down to the ground in thin areas.

Confidence

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

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