Bulletin d’avalanche

Purcells

Dec 19 – 20, 2025Avalanche Canada
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Archivé · expiré 9 months ago

Danger d’avalanche

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

Points saillants

Storm slabs remain reactive to human triggers, especially in wind affected terrain.

Continue to make conservative terrain choices while the storm snow settles and stabilizes.

Problèmes avalancheux

  • Persistent Slabs

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

    Triggering deeper weak layers is most likely to occur in isolated alpine areas where a supportive crust below the recent snow is not present.

  • Storm Slabs

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

    Up to 35 cm of recent snow and strong southwest winds have formed fresh storm slabs that will be most reactive in wind affected terrain.

Confidence

Moderate

  • Uncertainty is due to the limited number of field observations.

Avalanche Summary

On Wednesday, numerous natural and explosive triggered storm slab avalanches up to size 2 were reported primarily on north and easterly aspects at treeline and above.

Snowpack Summary

20-35 cm of recent snow and strong southwest winds have formed fresh storm slabs that will be most reactive in wind affected terrain. This recent snow overlies a 3 to 5 cm thick crust below 2200 m.

90 to 140 cm down is a weak layer of faceted snow at higher elevations or surface hoar in sheltered terrain.

100 to 160 cm down is a prominent crust which may have facets above or below.

Depth hoar(large facets) can be found at the bottom of the snowpack.

Weather Summary

Thursday Night
Cloudy. 10 to 20 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -5 °C. Freezing level 1600 m.

Friday
Mostly cloudy. 30 km/h west ridgetop wind. Treeline temperature -7 °C. Freezing level 1000 m.

Saturday
Mostly cloudy with isolated flurries. 0 to 5 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -8 °C. Freezing level valley bottom.

Sunday
Mix of sun and clouds. 30 km/h southwest ridgetop wind. Treeline temperature -6 °C. Freezing level valley bottom.




More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Make conservative terrain choices and avoid overhead hazard.
  • Avoid freshly wind-loaded features, especially near ridge crests, rollovers, and in steep terrain.
  • Use small, low consequence slopes to test the bond of the new snow.
  • Be aware of the potential for large avalanches due to buried weak layers.

Régions couvertes