Boletín de aludes

South Rockies

Dec 27 – 28, 2025Avalanche Canada
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Archivado · caducó 9 months ago

Peligro de aludes

Mon
Tue
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Lo esencial

Don't let blue skies & powder lure you into consequential terrain

Be mindful that deep instabilities still exist in the snowpack

Seek out good riding in sheltered terrain with no wind effect

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–2.5

    New snow and shifting winds will be building fresh wind slabs on all aspects at upper elevations. These slabs may be more reactive if they are poorly bonded to an underlying rain crust. Avoid leeward areas with denser wind-bown snow.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    2–3.5

    A deep persistent weak layer consisting of weak facets over a crust, remains a concern. The probability of triggering this layer is low, but with high consequences.

Confidence

Moderate

  • Forecast snowfall amounts are uncertain.
  • Uncertainty is due to the fact that deep persistent slabs are particularly difficult to forecast.

Avalanche Summary

On Monday, large, naturally triggered deep persistent slab avalanches were observed on north-facing slopes, suspected to have occurred sometime on Sunday. These failed on a deep persistent weak layer down 1-2 m, and some stepped down to the ground.

Check out this MIN from our field team.

Otherwise, no new avalanches have been reported, but observations are extremely limited in the region.

Snowpack Summary

Up to 15 cm is forecast to fall in the region by mid-morning on Saturday. This adds to approximately 10 to 20 cm of recent storm snow in the region. Combined with moderate shifting winds, this new snow is expected to form wind slabs at upper elevations.

Up to 10 mm of rain on Wednesday night formed a thin crust that reached at least treeline areas across much of the region. New wind slabs may not bond well to this crust.

A deep persistent weak layer consisting of a prominent crust, with 10 cm of facets on top, is buried 120 to 180 cm deep in terrain above 1800 m. Triggering this layer could have very severe consequences.

Weather Summary

Friday Night
Mostly cloudy. 5 to 10 cm of snow. 30 km/h southwest ridgetop wind. Treeline temperature -8 °C.

Saturday
Mix of sun and clouds. 1 to 5 cm of snow. 20 km/h variable ridgetop wind. Treeline temperature -18 °C.

Sunday
Mostly sunny. 30 km/h northwest ridgetop wind. Treeline temperature -15 °C.


Monday
Mostly sunny. 35 km/h west ridgetop wind. Treeline temperature -8 °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.
  • Recent wind has varied in direction, so watch for wind slabs on all aspects.
  • Avoid thin areas like rocky outcrops where you're most likely to trigger avalanches on deep weak layers.
  • Use conservative route selection and resist venturing into complex terrain.

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