Bollettino valanghe

South Rockies

Feb 7 – 8, 2012Avalanche Canada
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Archiviato · scaduto 15 years ago

Pericolo valanghe

Thu
Fri
Alta quota
2 · Moderato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
Apri la mappa completa

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–3
    Fresh wind slabs are expected to develop below ridge crests and behind terrain breaks in lee and cross-loaded terrain.

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    3–6
    Cornices are large, unsupported and may be a trigger for a large avalanche on the slope below.

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    3–6
    Deep and destructive persistent slabs have become less likely, but may be triggered with a large trigger (cornice fall, trenching sled); especially in unsupported, rocky terrain.

Confidence

Good - -1

Weather Forecast

Mainly cloudy with a chance of flurries for the forecast period. Freezing levels are expected to remain in valley bottoms. Winds could get quite gusty, but generally moderate from the southwest.

Avalanche Summary

Over the weekend widespread natural deep slab avalanche activity to Size 3 was reported. The avalanches occurred in response to a warming pattern that affected much of BC. Avalanche activity has decreased dramatically with the current cooling trend.

Snowpack Summary

The current snow surface is well on its way in becoming a dangerous weak layer once a sufficiently cohesive slab develops. Surface hoar is continuing to develop on sheltered slopes at all elevations combined with near-surface facets at lower elevations and surface crusts on sun-exposed slopes. At the base of the snowpack basal facets and depth hoar seem fairly widespread in the region. Basal facets recently became active again with warm temperatures, and remain a concern with heavy triggers, such as airborne sled impacts and cornice falls, on steep unsupported alpine slopes. In Elk Valley North and the Crowsnest, the average snowpack depth at treeline is 150 cms. In Elk Valley S and the Flathead the snowpack depth is closer to 2 m.

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