Bulletin d’avalanche

Blue River

Mar 21 – 22, 2025Avalanche Canada
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Archivé · expiré 2 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Avoid complex and wind-loaded terrain.

Storm slabs may need another day or two to stabilize and bond.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3

    Persistent weak layers of surface hoar/facets or crust remain a concern in the upper 50 - 100 cm. Storm slab avalanches could step down to these layers, forming very large avalanches.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2

    Storm slabs are slowly gaining strength but are expected to be most reactive on north through east facing wind-loaded features at upper elevations.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2

    Periods of sun on Saturday are expected to trigger wet loose avalanches. Avoid overhead hazard from steep sunny slopes.

Confidence

Moderate

Avalanche Summary

Reports have been limited during the recent stormy period. On Thursday a very large (size 2.5) dry loose avalanche happened near Blue River on a south-facing alpine slope.

On Wednesday, two small (size 1) skier-triggered wind slabs occurred at treeline on a northeast-facing slope

With warming and sun in the forecast, we expect there will be potential for both natural and human-triggered large avalanches on Saturday.

Snowpack Summary

Up to 60 cm of recent snow has formed widespread storm slabs. These slabs are expected to be thickest and most reactive on wind-loaded north and east-facing slopes. Sunny slopes may have moist snow during the warmest parts of the day.

Three persistent weak layers consisting of surface hoar, facets, or a crust may be found in the upper to mid-snowpack:

  • The early March layer buried 50 - 100 cm. This is the primary weak layer of concern.

  • The mid-February layer buried 70 - 150 cm.

  • The late January layer buried 120 - 180 cm.

The lingering concern for the Feb and Jan weak layers is in shallow or rocky areas, otherwise, these are unlikely to trigger.

Weather Summary

Friday night

Partly cloudy with flurries of up to 3 cm possible. 25 km/h west ridgetop wind. Treeline temperature -8 °C.

Saturday

A mix of sun and cloud. 20 km/h west ridgetop winds. Treeline temperature -5 °C.

Sunday

Mostly cloudy with 2 to 5 cm, up to 15 cm coming Sunday night. 35 to 45 km/h southwest ridgetop winds. Treeline temperature -2 °C. Freezing level rising to 1500 m.

Monday

Cloudy with 0 to 10 cm of snow. 30 to 40 km/h west ridgetop wind. Treeline temperature 0 °C. Freezing level rising to 1800 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be especially cautious as you transition into wind-affected terrain.
  • Even brief periods of direct sun could produce natural avalanches.
  • Keep your guard up as storm slabs may remain sensitive to human triggering.

Régions couvertes