Boletín de aludes

Northwest Coastal

Apr 25 – 28, 2025Avalanche Canada
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Peligro de aludes

Sun
Mon
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Lo esencial

Daytime warming may trigger loose avalanches and cornices, which could trigger buried layers. Monday's storm may form new slabs.

This is the final daily avalanche forecast for the season.

Problemas de aludes

  • Wind Slabs

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

    Wind slabs may linger in steep, high-elevation lee slopes. Monday's storm may form new slabs over the day.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    3–5

    Buried weak layers from February and March continue to produce periodic large avalanches. Large loads like cornice falls are a prime trigger for them. Avalanches are most likely in north-facing alpine terrain.

  • Loose Wet

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

    Wet loose avalanches and cornice failures are possible with daytime warming. Avoid travel on sun-exposed slopes during the heat of the day and limit your travel on or below corniced ridges.

Terrain and Travel Advice

  • Be aware of the potential for large, destructive avalanches due to deeply buried weak layers.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Limit exposure to steep, sun exposed slopes, especially when the solar radiation is strong.

Confidence

Moderate

Avalanche Summary

Thursday saw many small (size 1) wet loose avalanches on all aspects and mostly in the alpine. Explosives triggered a few large (size 2) avalanches on northerly alpine slopes, likely releasing in the shallower weak layer described in the Snowpack Summary.

Large loads, such as cornice failures, continue to be the most likely trigger for persistent slab avalanches.

Snowpack Summary

Around 10 to 15 cm of dry snow may be found on high elevation north aspects, with potentially deeper deposits in immediate lee terrain due to recent southwest wind. Elsewhere, a hard melt-freeze crust is likely found on the snow surface, which may soften with daytime warming. Monday's storm will build on top of these surfaces and likely form new slabs in lee terrain.

At alpine and treeline elevations, a layer of surface hoar that formed in early March may be found around 70 to 120 cm deep. A layer of facetted grains and a crust that formed mid-February may be found 120 to 200 cm deep.

The remainder of the snowpack is consolidated.

Weather Summary

Friday Night

Partly cloudy. 10 to 20 km/h west ridgetop wind. Treeline temperature -4 °C.

Saturday

A mix of sun and clouds. 10 km/h north ridgetop wind. Treeline temperature -1 °C. Freezing level 1200 m.

Sunday

Mostly sunny. 10 to 20 km/h southeast ridgetop wind. Treeline temperature +2 °C. Freezing level 1500 m.

Monday

Cloudy with 10 to 20 cm of snow. 20 to 40 km/h south ridgetop wind. Treeline temperature 0 °C. Freezing level 1300 m.

More details can be found in the Mountain Weather Forecast.

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