Bulletin d’avalanche

Northwest Inland

Apr 2 – 3, 2017Avalanche Canada
Voir sur la carte
Archivé · expiré 9 years ago

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible

Points saillants

Watch for changing snow conditions when the sun comes out. Slab avalanche activity is possible at higher elevations, and will be more likely when the snow is soft and warm.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Wind slabs are likely lingering in the lee of exposed terrain. Fresh cornices may also be weak and fall off naturally when hit by the sun.
  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    2–3
    A weak layer of facets and/or a crust that developed early in the winter lies near the bottom of the snowpack. Strong solar radiation or a cornice fall are possible triggers.

Confidence

Moderate - Due to the number and quality of field observations

Weather Forecast

MONDAY: Sunny skies, light winds, and freezing level rising to 1200 m after an overnight freeze.TUESDAY: Overcast with light snow in the evening, increasing south wind, and freezing level climbing to 1400 m. WEDNESDAY: Scattered flurries with about 5 cm, strong south wind, and freezing level around 1400 m.

Avalanche Summary

A natural cornice fall released a wind slab or perhaps a persistent slab on a northeast aspect that was size 2.5; this was reported from the Microwave on Thursday but may have occurred on Wednesday (see the full MIN report here). Storm slabs up to size 2.5 were reported from the western extent of the region in the Howson's, where the snowpack is more like the Northwest Coastal region. No new avalanches have been reported from the rest of the region.

Snowpack Summary

Light snow combined with moderate southwest winds has developed wind slabs in the alpine and in some exposed treeline locations. Periods of sun and high daytime freezing levels have developed crusts below treeline and on sun exposed terrain at all elevations. The snow may be moist or wet below treeline during the warmest part of the day. The February crust and facet layer was reported to be down 75-90 cm in the Houston Telkwas sled area on Wednesday. The deep persistent weak layer of facets and/or a crust that were buried early in the winter are still lingering near the bottom of the snowpack. This MIN report found the deep weak layer strengthening in the Telkwas.

Régions couvertes