Bulletin d’avalanche

South Rockies

Avalanche Canada
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Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Périmé — ce bulletin a expiré 4 months ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Persistent buried layers in the alpine remain uncertain

Steer clear of large cornices and steep, rocky alpine start zones.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2.5

    Cornices are large and fragile, and may trigger large avalanches on the slopes below.

  • Persistent Slabs

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

    Triggering this layer of facets over a hard crust (50-70 cm deep) is most likely on steep slopes with a shallow snowpack. Large loads like cornices falls are the most likely triggers.

Confidence

Moderate

  • We are uncertain about how persistent slabs will react to the forecast weather.
  • We are uncertain due to a limited number of field observations.

Avalanche Summary

No new avalanches were reported in the last 3 days.

On Wednesday, our team reported a size 2.5 persistent slab on Window Mountain, likely triggered by a cornice fall on Tuesday (see photo below). Another large avalanche was observed on Saturday, likely on the same buried weak layer.

Observations from this region are currently limited. Please consider submitting a MIN to let us know what you're seeing out there.

Weather Summary

Sunday Night
Partly cloudy. 20 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2100 m.

Monday
Mostly cloudy. 1 mm of precipitation as snow or rain at treeline. 30 km/h west ridgetop wind. Treeline temperature 1 °C. Freezing level 2200 m.

Tuesday
Mostly cloudy. 4 to 5 mm of precipitation as snow or rain at treeline. 50 km/h west ridgetop wind. Treeline temperature -1 °C. Freezing level 2000 m.

Wednesday
Mostly cloudy. 3 to 5 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1800 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Cornice failures could trigger large and destructive avalanches.
  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and slopes above cliffs.

Régions couvertes