Boletín de aludes

Kootenay Boundary

Dec 22 – 23, 2024Avalanche Canada
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Archivado · caducó 2 years ago

Peligro de aludes

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

When the snowpack is the question, terrain is the answer.

Uncertainty necessitates conservative terrain selection and good travel habits.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–1.5

    New snow and wind are expected to form fresh, reactive wind slabs at upper elevations.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1.5–3

    Surface hoar, and in some areas facets over a crust, have produced large avalanches and shown reactivity in tests in the past few days. Be especially cautious in steep openings at treeline and below.

Confidence

Moderate

Avalanche Summary

A widespread natural avalanche cycle took place during the storm last Wednesday. Following this storm, the most notable avalanche activity has been large (size 2) persistent slab avalanches failing on buried crust/facets or surface hoar.

Listen to Friday night's State of the Snowpack for more details on the snowpack and avalanche danger in the Nelson area.

Snowpack Summary

Up to 15 cm of new snow will add to 60 cm of recent storm snow. Southwest winds have redistributed this snow into deeper deposits in lee terrain features at higher elevations.

In the mid snowpack (down 40 to 100 cm) there are weak layers of facets, crusts, and in some places surface hoar. The distribution of these layers is highly variable throughout the region. The areas showing the greatest reactivity in these layers are the Goat Range, Bonningtons, and Rossland Range.

The lower snowpack is strong and bonded. Treeline snow depths range from 100 to 180 cm.

Weather Summary

Saturday Night

Cloudy with 5 to 15 cm of new snow. 20 to 50 km/h southwest ridgetop wind. Treeline temperature -4 °C.

Sunday

Cloudy with up to 2 cm of new snow. 15 to 30 km/h southwest ridgetop wind. Treeline temperature -5 °C.

Monday

Cloudy with up to 5 cm of new snow. 15 to 40 km/h southwest ridgetop wind. Treeline temperature -4 °C.

Tuesday

Cloudy with up to 15 cm of new snow. 20 to 50 km/h southwest ridgetop wind. Treeline temperature -3 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Approach steep and open slopes at and below treeline cautiously, as buried surface hoar may exist.
  • Surface hoar distribution is highly variable. Avoid generalizing your observations.
  • Be aware of the potential for large avalanches due to a buried crust.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.

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