Bulletin d’avalanche

Northwest Coastal

Apr 12 – 13, 2018Avalanche Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Sat
Sun
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Forecast new snow and strong winds Thursday night are expected to create fresh storm slabs reactive to human triggers in wind effected terrain.

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    New snow may bond poorly to an underlying crust. Watch for fresh storm slabs in leeward areas near ridge crests and convex features.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    When the sun comes out it will quickly weaken the new snow and cause loose wet avalanching on steep solar slopes.

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

TONIGHT: 5-10 cm new snow. Strong to extreme southeasterly ridgetop winds. Freezing level around 500 m.FRIDAY: 5-10 cm new snow. Strong southerly ridgetop winds. Freezing level around 1000 m.SATURDAY: 5-10 cm new snow. Light southeasterly ridgetop winds. Freezing level around 1000 m.SUNDAY: Mix of sun and cloud. Light northeasterly ridgetop winds. Freezing level rising to around 1300 m.

Avalanche Summary

On Wednesday, a size 2.5 persistent slab avalanche was remotely triggered by a group of skiers on a ridgetop from 10 m away. The avalanche failed on surface hoar about 70 cm deep on a north aspect at 1800 m. A size 2 wet slab was triggered by day-time warming in the same area near Bear Pass.

Snowpack Summary

5-15 cm of new snow and strong southeasterly winds have formed fresh storm slabs.In the south of the region, two layers of surface hoar are buried approximately 70-100 cm deep. The layers are most prominent on north to east aspects and were buried early-March and mid-March. In the north of the region, these layers are around 40 cm deep.Bellow these March layers the mid-pack is generally well-settled and strong. However, shallower parts of the region, such as the far north, have weak sugary facets near the bottom of the snowpack.

Régions couvertes