Bulletin d’avalanche

Lizard-Flathead

Jan 8, 2018Avalanche Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Tue
Wed
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Warming, snow and wind are all adding stress to touchy weak layers.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Wind slabs can be found at treeline and alpine elevations.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Weak layers are buried within a prime depth range for human triggering. These are most prevalent at and below treeline. Warming, snow and wind are all adding stress to these layers.

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

MONDAY: Strong to gale south-west winds. Flurries. Alpine temperature near 0.TUESDAY: Strong south-west winds. Around 5 cm snow. Alpine temperature near 0. A further 10-15 cm snow overnight.WEDNESDAY: Light south-west winds. Light snow. Alpine temperature near -6.

Avalanche Summary

Explosives triggered several size 1.5-2.5 storm slabs on Saturday. Many large whumpfs and cracks continue to be reported, especially at and below treeline, indicating the persistent slab problem remains touchy. Persistent slab activity is likely to increase over the next couple of days.On Thursday, a skier-triggered size 2 slab on a north-east aspect at 1975 m near Fernie caught and partially buried four people. Check out the details here.

Snowpack Summary

A touchy weak layer from mid-December (predominantly feathery surface hoar crystals and/or a sun crust) is found down about 40-70 cm. It is found at and below treeline, and seems particularly touchy between about 1600-1800 m. As temperatures warm, the slab above this weakness may become even easier to trigger remotely or with the weight of a person.Wind slabs and cornices can be found at ridge top. Deeper in the snowpack, an early season rain crust and sugary facets make up the picture. It is possible that a surface avalanche could step down to these layers, creating a surprisingly large event.

Régions couvertes