Avalanche forecast

Microwave-Sinclair

Mar 25 – 26, 2025Avalanche Canada
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Avalanche danger

Thu
Fri
Alpine
3 · Considerable
Treeline
3 · Considerable
Below
2 · Moderate
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Highlights

Large persistent slab avalanches have been occurring across the region, making low-angle, conservative terrain the best choice.

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2

    Wind slabs will be most reactive where they overly surface hoar.

  • Persistent Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible - Likely
    Size
    1.5–2.5

    Facets and/or surface hoar buried 40 to 80 cm deep are most prominent on north-facing slopes. Avoid areas with a thin or variable (thin to thick) snowpack.

Confidence

Moderate

Avalanche Summary

Many size 2 to 3 persistent slab avalanches were reported on the Mountain Information Network over the weekend (see photos). This includes several slabs triggered by riders, including remotely. The AvCan field team observed some large natural slabs at Seaton that likely occurred on Monday.

Snowpack Summary

Light snow and southerly winds continue to redistribute recent snowfall. This snow is accumulating on a layer of surface hoar buried 30 to 50 cm deep. This layer of surface hoar is present in the alpine and on aspects that are not exposed to sunlight.

Another layer of facets, surface hoar and/or a crust buried in mid-February is 40 to 80 cm below the snow surface and has been reactive in snowpack tests.

Deeper in the snowpack, a weak layer of facets and a crust from early December can be found. This layer appears to be dormant but is still worth keeping in mind in thin snowpack areas in the alpine.

Weather Summary

Tuesday Night

Partly cloudy. 10 km/h south ridgetop wind. Treeline temperature -2 °C.

Wednesday

Mix of sun and cloud. 20 km/h southeast ridgetop wind. Treeline temperature -1 °C. Freezing level 1600 m.

Thursday

Mix of sun and cloud with 0 to 2 cm of snow. 40 km/h southeast ridgetop wind. Treeline temperature -3 °C. Freezing level 1200 m.

Friday

Mostly cloudy with 0 to 1 cm of snow. 40 km/h southeast ridgetop wind. Treeline temperature -6 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid shallow snowpack areas, rocky outcrops, and steep terrain where triggering is most likely.
  • Be aware of the potential for large avalanches due to buried weak layers.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.

Regions covered