Bulletin d’avalanche

Esplanade

Apr 12 – 13, 2025Avalanche Canada
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Archivé · expiré last year

Danger d’avalanche

Mon
Tue
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
1 · Faible
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Points saillants

Buried surface hoar continues to produce natural and remotely triggered avalanches on north facing slopes.

Stick to conservative terrain, free from overhead hazard.

Problèmes avalancheux

  • Wind Slabs

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

    Fresh and reactive wind slabs exist at upper elevations. Watch for wind loaded features near ridgelines and mid slope rollovers.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    2–3.5

    Surface hoar produced large and remotely triggered avalanches on north through east facing slopes at high elevations. On south facing slopes this layer exists as a crust and may be reactive during warming or periods of strong sunshine.

  • Loose Wet

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

    Wet loose avalanches become more likely on sun affected slopes if the surface crust breaks down.

Confidence

Moderate

Avalanche Summary

Recent avalanche activity on the buried surface hoar layer includes naturally triggered slabs to size 3, and human-triggered to size 2, including remote triggers.

These occurred on high elevation north facing slopes in the Selkirks. Reactivity is most notable in wind affected terrain.

Snowpack Summary

Surface conditions at higher elevations vary from wind affected surfaces to crusts on south facing slopes.

A reactive layer of surface hoar on sheltered north facing slopes can be found 30-70 cm deep, at upper treeline and alpine elevations. This layer is present as a crust on south facing slopes.

Several melt freeze crusts can be found throughout the upper snowpack. Weak layers buried in early March, February, and January are now anywhere from 150 cm to 250 cm deep.

Weather Summary

Saturday Night

Cloudy with flurries overnight. 30 to 40 km/h west ridgetop wind. Freezing levels drop to valley bottom.

Sunday

Mostly clear skies. 10 to 20 km/h west ridgetop wind. Treeline temperature -1 °C. Freezing level 1900 m.

Monday

Partly cloudy. 20 to 40 km/h southwest ridgetop wind. Treeline temperature +4 °C. Freezing level 2500 m.

Tuesday

Partly cloudy with flurries. 20 to 40 km/h northwest ridgetop wind. Treeline temperature 0 °C. Freezing level 2000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid shallow snowpack areas, rocky outcrops, and steep terrain where triggering is most likely.
  • Be especially cautious as you transition into wind-affected terrain.
  • Be aware of the potential for remote triggering and large avalanches due to buried surface hoar.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Régions couvertes