Bulletin d’avalanche

Kootenay Boundary

Mar 4 – 5, 2026Avalanche Canada
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Archivé · expiré 7 months ago

Danger d’avalanche

Fri
Sat
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

New snow combined with reactive weak layers is creating dangerous conditions

If you see more than 20 cm of new snow, treat the danger as HIGH

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1.5–3

    Be aware of the potential for remote-triggering and large avalanches due to buried surface hoar, especially at treeline and below.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2

    Up to 20 cm of new snow and wind will be forming reactive storm slabs. Thier size and sensitivity will increase throughout the day. These slabs will be most reactive in lee areas by ridgetops, and could step-down to deeper weak layers.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–1.5

    Rain at lower elevations on Wednesday may create potential for wet loose sluffing, especially in steep terrain. Use appropriate sluff management techniques if the snow surface is wet.

Confidence

Moderate

  • We are confident that there are persistent slabs in the snowpack, but uncertain about how likely they are to trigger.
  • We are uncertain about forecast precipitation amounts.

Avalanche Summary

Every day in the last week, large, persistent avalanches have been triggered by riders or failed naturally; many have occurred around steep openings in treed areas.

Check out these recent MIN reports for more details:

Mar 1 MIN: very close call

Feb 28 MIN A fatal accident occurred involving two sledders.

Feb 27 MIN: remote triggered from 50 m away

Feb 24 MIN: 80-100 cm thick fresh persistent slabs

Snowpack Summary

Around 10 to 20 cm of snow is forecast for overnight through Wednesday, with potential for rain below 1900 m. This new snow will be falling on a crust with a new layer of surface hoar in most areas except for shady high elevation terrain where the crust is absent.

In the top 100 cm of the snowpack, there are multiple concerning persistent weak layers of surface hoar and/or facets/crusts. The majority of recent large and destructive avalanches have been on well-preserved surface hoar in sheltered areas at treeline and below.

The remaining snowpack has no current layers of concern.

Weather Summary

Tuesday Night
Cloudy. 10 to 20 cm of snow or rain at treeline. 40 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2000 m.

Wednesday
Cloudy. 5 to 15 cm of snow at treeline, possible rain below. 30 km/h southwest ridgetop wind. Treeline temperature -1 °C. Freezing level 1900 m.

Thursday
Mix of sun and clouds. 1 to 5 cm of snow. 30 km/h northwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1700 m.

Friday
Mix of sun and clouds. 530 km/h northwest ridgetop wind. Treeline temperature -2 °C. Freezing level 1800 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid avalanche terrain during periods of heavy loading from new snow, wind, or rain.
  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • Be aware of the potential for remote triggering and large avalanches due to buried surface hoar.
  • Make conservative terrain choices and avoid overhead hazard.

Régions couvertes