Boletín de aludes

Northwest Coastal

Apr 12 – 13, 2025Avalanche Canada
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Archivado · caducó last year

Peligro de aludes

Mon
Tue
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Lo esencial

Forecasted snowfall amounts are highly variable, assess your local field conditions and if new snowfall accumulations exceed 20 cm bump your danger rating to CONSIDERABLE.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2

    Expect wind slab development on north aspect terrain, near and below ridge crests.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–3.5

    Several weak layers persist in the snowpack. These layers are most likely to be reactive at upper elevations where no surface crust has formed. Surface instabilities or large triggers may step-down to these deeper layers.

Confidence

Moderate

Avalanche Summary

Over the past week, explosive-controlled avalanches up to size 3 have been reported daily, involving cornice failures, wind slabs, and wet loose.

Last Friday, a failing cornice triggered a size 3 avalanche on an eastern slope in the alpine. This avalanche is believed to have occurred on the March 5th surface hoar layer.

Where a thick, supportive surface crust is found, we expect that triggering avalanches on buried weak layers is unlikely.

Snowpack Summary

5 to 25 cm of new snow sits on variably wind affected snow in open terrain at upper elevations. A crust is found up to 1800 m and higher on solar slopes.

Three layers of note currently exist in the upper-mid snowpack.

  • A layer of surface hoar and a crust that formed in mid-March can be found 50 to 80 cm below the snow surface.

  • Another layer of surface hoar that formed in early March can be found at a depth of 70 to 120 cm.

  • A layer of facets, surface hoar, and/or a crust from mid-February is buried 120 to 200 cm deep.

The remainder of the snowpack is well consolidated, and there are no current concerns.

Weather Summary

Saturday Night

Cloudy with 5 to 10 cm of new snow. 10 to 30 km/h southwest ridgetop wind. Treeline temperature -3°C. Freezing level 1000 m.

Sunday

Cloudy with up to 10 cm snow. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -2°C. Freezing level 1200 m.

Monday

Cloudy with up to 15 cm snow. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -3°C. Freezing level 1000 m.

Tuesday

Mix of sun and cloud with flurries. 10 to 30 km/h southwest ridgetop wind. Treeline temperature -3°C. Freezing level 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Be aware of the potential for large, destructive avalanches due to deeply buried weak layers.
  • Cornice failures could trigger large and destructive avalanches.
  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.

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