Bulletin d’avalanche

South Rockies

Avalanche Canada
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Danger d’avalanche

Tue
Wed
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Périmé — ce bulletin a expiré 5 months ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

A buried weak layer exists and could produce large slab avalanches.
Choose conservative terrain in the alpine and avoid exposure to overhead avalanche terrain.

Problèmes avalancheux

  • Cornices

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

    Sun and warmth make cornice failures more likely. Avoid travelling under them.

  • Persistent Slabs

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

    Facets have developed over a crust formed after the atmospheric river. This layer is now buried 50 to 70 cm deep and has produced a recent large avalanche and has been reactive in snowpack tests.

  • Loose Wet

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

    Wet loose avalanches are likely when the upper snowpack feels like a slushy. Avalanches may become large if the overnight crust recovery is weak.

Confidence

Moderate

  • Persistent slabs could become more likely with the forecast weather.

Avalanche Summary

On Saturday, numerous rider-triggered wet loose avalanches were reported, along with several that occurred naturally.

On Friday, a large (size 2.5) persistent slab was accidentally triggered in The Gorge near Elkford. The rider deployed an airbag and was found and extracted quickly by their riding partners. Read the full report here.

Snowpack Summary

A weak crust is expected to form Sunday night. Multiple crusts are in the upper snowpack on slopes that see the sun. There is likely a crust on all aspects below treeline, but not on shaded slopes at treeline and above.

A crust that formed after the atmospheric river in early March is down 50 to 70 cm, and weak facets have been observed over the crust.

Below this, the snowpack is generally well consolidated with facets at the base of the snowpack in shallow areas near Elkford.

Weather Summary

Sunday Night
Mostly cloudy. 20 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level falling to 1500 m.

Monday
Mix of sun and clouds. 20 to 50 km/h southwest ridgetop wind. Treeline temperature 2 °C. Freezing level rising to 2900 m.

Tuesday
Mix of sun and clouds. 4 to 5 mm of precipitation, starting as rain at treeline and turning to snow. 40 to 70 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level falling to 1500 m.

Wednesday
Mix of sun and clouds. 30 km/h west ridgetop wind. Treeline temperature -5 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for large avalanches due to buried weak layers.
  • Even brief periods of direct sun could produce natural avalanches.
  • Start your day early and be out of avalanche terrain during the heat of the day.

Régions couvertes