Bulletin d’avalanche

South Coast Inland

Avalanche Canada
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Danger d’avalanche

Mon
Tue
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Périmé — ce bulletin a expiré 5 months ago. Vous consultez des conditions passées, pas le bulletin en cours.

Points saillants

Quick as a bunny we have hopped from cold and snowy to warm spring conditions.

Large cornice falls may trigger deeper layers on the slopes below. Be very cautious of overhead hazard.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1.5–2.5

    Cornices are large and fragile, with warming temperatures there is a chance that a cornice fall may trigger a large, deeper avalanche on slopes below.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3.5

    Two crusts, buried in early February (facets on top) and March seem to be gaining strength. It's still smart to avoid thin, rocky areas on steep slopes, and avoid exposing yourself to slopes below large cornices.

  • Loose Wet

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

    Strong solar input and rising temperatures will cause a loose wet avalanche cycle. Watch for signs of warming, and be prepared to retreat from terrain. Deeper snow deposits still exist in lee areas and may be triggered easily.

Confidence

High

  • We have a good understanding of the snowpack structure and confidence in the weather forecast.
  • We are confident the likelihood of avalanches will increase with the forecast weather.
  • We are confident the snowpack will rapidly weaken with the forecast weather.

Avalanche Summary

On Friday, a couple large human-triggered wind slab avalanches occured throughout the region.

On Thursday, a few small natural dry loose avalanches occurred.

On Wednesday, a large cornice fall triggered a large avalanche on the slope below. The debris is reported to have run far.

If you are heading into the backcountry, consider sharing your observations and posting a MIN.

Snowpack Summary

Warm daytime temperatures and clear nights have formed a surface crust in many areas, with wet or slushy surface snow elsewhere. Dry snow may temporarily be preserved in sheltered high alpine terrain.

Expect to find 30 to 50 cm of settling snow over a thick and hard crust below about 1900 m, and old wind-affected snow at upper elevations.

Two older crusts (1-1.5 m deep), buried in early February and March previously produced large to very large avalanches, but they seem to have gained strength and are not a current concern. However, each day of warm weather may increase the likelihood of these layers becoming active again.

Weather Summary

Saturday Night
Clear skies. 20 km/h west ridgetop wind. Treeline temperature -1 °C. Freezing level 1800 m.

Sunday
Sunny. 20 km/h southwest ridgetop wind. Treeline temperature 2 °C. Freezing level 2400 m.

Monday
Mostly sunny. 50 km/h southwest ridgetop wind. Treeline temperature 3 °C. Freezing level 2500 m.

Tuesday
Mix of sun and clouds. 3 to 5 cm of snow. 40 km/h west ridgetop wind. Treeline temperature -4 °C.

Warming weather will change the game, click this link for great terrain and travel advice.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid steep, sun-exposed slopes when the air temperature is warm or when solar radiation is strong.
  • The more the snowpack warms up and weakens, the more conservative your terrain selection should be.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • The likelihood of deep persistent slab avalanches will increase with each day of warm weather.

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