Bulletin d’avalanche

Northwest Inland

Dec 10 – 11, 2012Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
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Points saillants

Avalanche danger may spike to HIGH on Tuesday if strong winds continue.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–5
    Widespread wind slabs are likely to be found on alpine slopes and behind ridges and ribs at treeline and below.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–6
    A deeply buried facet/crust weakness exists. While the likelihood of triggering is relatively low, the consequences could be a very large and destructive avalanche.

Confidence

Fair - Timing, track, or intensity of incoming weather is uncertain for the entire period

Weather Forecast

Monday night: Expect winds of up to 90 km/h from the SW and about 15 cm of snow overnight. Alpine temp -6.Tuesday: Westerly winds dropping to moderate. Alpine temp -8. Light snow. Freezing level 600 m, dropping to 200 m overnight.Wed: Light NW winds. Alpine temp -8. Freezing level at surface. Light to moderate snow.Thurs: Moderate SW winds. Alpine temp -5. Freezing level 400 m. 8-10 cm snow. 

Avalanche Summary

Strong W-NW winds triggered a natural avalanche cycle on Sunday, with several slabs to size 2 failing behind cross-loaded ribs and gullies. A size 2.5 slab from the headwall above the Hankin area uptrack is suspected to have failed on the Nov crust/facet layer.  

Snowpack Summary

Storm snow has been redistributed by very strong W-NW winds, creating touchy wind slabs on a variety of slopes, even below treeline. In the upper snowpack, surface hoar is buried at tree line in isolated sheltered areas. A November crust/facet layer near the base of the snowpack has the potential for deep releases. Snow depths are highly variable due to the influence of recent winds.

Régions couvertes