Bulletin d’avalanche

North Columbia

Mar 25 – 26, 2025Avalanche Canada
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Archivé · expiré 2 years ago

Danger d’avalanche

Thu
Fri
Alpin
4 · Fort
Limite forestière
4 · Fort
Sous la limite
4 · Fort
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Points saillants

Avoid all avalanche terrain.

Large avalanches may run into the valley bottom from the alpine.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    2–5

    Persistent weak layers are overloaded and primed for triggering, and natural failure.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Very Likely
    Taille
    1–3.5

    Storm slabs, both wet and dry, may fail with high temperatures and solar input. They may step down to deeper weak layers.

  • Loose Wet

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

    Wet loose avalanches are likely with high temperatures and potential sun. Avoid being on or underneath slopes in the sun.

Confidence

High

Avalanche Summary

A large avalanche cycle occurred on Monday and likely into Tuesday. With many storm slabs stepping down to deep weak layers, causing very large avalanches, up to size 4.

In the southeast of the region on Monday, there was a fatal avalanche incident. A group was hit by a large (size 3) natural persistent slab avalanche.

Snowpack Summary

Up to 50 cm of recent snow is rapidly warming and expected to see the sun for the first time. The upper snowpack is expected to become moist and wet.

There is a significant concern for avalanches in motion to step down to deeper, persistent weak layers. These consist of surface hoar, facets, or a crust:

  • Early-March layer down 80–120 cm. This is the primary persistent layer of concern.

  • Mid-February & Late-January layers down 100–200 cm. Warm temperatures and sunshine may trigger these deep layers. Likewise, large triggers, like cornice fall or avalanches in motion, could step down.

Weather Summary

Tuesday Night

Cloudy with 0 to 10 mm/cm of rain/snow. 20 to 40 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2400 m.

Wednesday

A mix of sun and cloud. 20 to 30 km/h southwest ridgetop wind. Treeline temperature 3 °C. Freezing level 3000 m.

Thursday

Cloudy with 10 to 30 mm/cm of rain/snow. 20 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level falling to 2000 m.

Friday

Mostly cloudy with 5 to 15 mm/cm of rain/snow. 10 to 20 km/h southeast ridgetop wind. Treeline temperature -2 °C. Freezing level 1800 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Only the most simple non-avalanche terrain with no overhead hazard is appropriate at this time.
  • Even brief periods of direct sun could produce natural avalanches.
  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • Avoid the runout zones of avalanche paths. Avalanches could run full path.

Régions couvertes