Avalanche forecast

Sea To Sky

Apr 6 – 7, 2025Avalanche Canada
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Avalanche danger

Tue
Wed
Alpine
3 · Considerable
Treeline
3 · Considerable
Below
2 · Moderate
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Highlights

Forecast snow and wind will form storm slabs most reactive to human triggers in wind affected terrain at upper elevations.

Make conservative terrain choices and avoid overhead hazard.

Avalanche problems

  • Cornices

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

    Cornices loom over ridgetops and may be triggered by rapid snow loading or people traveling along ridgelines.

  • Storm Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Likely
    Size
    1–2.5

    Storm slabs are expected to be most reactive in wind affected terrain at upper elevations.

Confidence

Moderate

Avalanche Summary

On Saturday, numerous naturally triggered size 1 wet loose avalanches were reported on solar aspects.

Forecast snow and wind are expected to form reactive storm slabs.

Snowpack Summary

Forecast 15 to 25 cm of snow (above 1200 m, rain below) on Sunday night will form fresh storm slabs. They will be sitting on either moist snow or a crust everywhere except north facing slopes in the alpine where they will overlie a mix of dry snow and surface hoar.

The storm slabs are expected to be most reactive in wind affected terrain at upper elevations.

Old persistent weak layers may still exist 1 to 3 m deep on high north-facing slopes.

The snowpack thins quickly at lower elevations.

Weather Summary

Sunday Night

Snow, 15 to 25 cm above 1200 m, rain below. 20 to 30 km/h south ridgetop wind. Treeline temperature 0 °C. Freezing level 1600 m.

Monday

Mostly cloudy with flurries, 5 to 15 cm of snow above 1000 m. 20 to 30 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1500 m.

Tuesday

Cloudy with flurries, 5 to 15 cm snow. 20 to 30 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1500 m.

Wednesday

Mostly cloudy with isolated flurries, 0 to 5 cm snow. 5 to 10 km/h south ridgetop wind. Treeline temperature -1 °C. Freezing level 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Make conservative terrain choices and avoid overhead hazard.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Use small, low consequence slopes to test the bond of the new snow.
  • Avoid travelling on slopes below cornices.

Regions covered