Bulletin d’avalanche

Northwest Coastal

Apr 15, 2018Avalanche Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Mon
Tue
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Rising temperatures and sunny skies on Sunday will likely trigger loose wet avalanches on steep slopes facing the sun.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Sunshine may cause recently formed wind slabs to become more reactive to human triggers.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    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 - Due to the number of field observations

Weather Forecast

SUNDAY: Mostly sunny. Light northeasterly ridgetop winds. Alpine temperature +2. Freezing level rising to around 1400 m.MONDAY: Mostly sunny. Light northeasterly ridgetop winds. Alpine temperature 0. Freezing level around 1200 m.TUESDAY: Mostly cloudy with sunny breaks. Light southwesterly ridgetop winds. Alpine temperature -1. Freezing level around 1100 m.

Avalanche Summary

No new avalanches were reported in this region on Friday. 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

10-20 cm of recent storm snow and strong variable winds have formed wind slabs on a variety of aspects at treeline and above.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