Bulletin d’avalanche

Crowsnest North

Dec 16 – 17, 2025Avalanche Canada
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Archivé · expiré 10 months ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Avoid wind loaded areas.
A buried weak layer is best dealt with through conservative terrain selection.

Problèmes avalancheux

  • Wind Slabs

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

    Strong wind has likely built slabs in lee terrain. Possibly further down slope than you might expect.

  • Persistent Slabs

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

    A crust buried deep in the snowpack has proven reactive to large loads, particularly in steep, exposed terrain. A small wind slab avalanche may be enough of a load to step down to this deeper layer.

Confidence

Low

Avalanche Summary

No avalanche activity has been reported since the warm and wet storm last week. When several large persistent slab avalanches occurred.

Snowpack Summary

Up to 15 cm of snow has been blown around by strong winds and sits on a widespread melt–freeze crust, which is likely everywhere except high-alpine terrain.

A mid-November crust is buried 50 to 100 cm deep. Beneath it, the snowpack contains several additional crusts, and in some locations, a weak, sugary facet layer near the ground.

At treeline, snow depths range from roughly 50 to 100 cm, tapering off quickly at lower elevations.

Weather Summary

Monday Night
Cloudy with up to 10 mm of precipitation as snow or rain at treeline. 60 to 80 km/h southwest ridgetop wind. Treeline temperature -1 °C. Freezing level falling to 1500 m.

Tuesday
Cloudy with 5 cm of snow. 40 to 60 km/h southwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1600 m.

Wednesday
Mostly cloudy with 25 to 35 cm of snow. 50 to 80 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1700 m.

Thursday
Mostly cloudy with 2 to 3 cm of snow. 40 km/h southwest ridgetop wind. Treeline temperature -6 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.
  • Be aware of the potential for large avalanches due to buried weak layers.

Régions couvertes