Bollettino valanghe

Northwest Coastal

Feb 26 – 27, 2016Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 11 years ago

Pericolo valanghe

Sun
Mon
Alta quota
3 · Marcato
Limite del bosco
2 · Moderato
Sotto il limite
1 · Debole
Apri la mappa completa

In sintesi

Avalanche danger is one step higher in the north, where the recent storm dropped more snow.

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    1–4
    New and old wind slabs are lurking on many alpine and treeline slopes.

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely
    Dimensione
    3–6
    A storm slab or wind slab could step down and trigger a deeply buried weak layer, creating a surprisingly large avalanche.

Confidence

Moderate - Timing of incoming weather systems is uncertain

Weather Forecast

Expect a cloudy lull in the weather on Saturday before a front brings around 10-15 cm snow on Sunday. The freezing level is expected to be around 1000 m during the front, with strong southerly winds. Snowfall and winds ease on Monday.

Avalanche Summary

A cycle of naturally-triggered large wind slabs was observed on slopes lee to the south around Bear Pass on Thursday. Explosives also triggered size 1-2 storm slabs and wind slabs. Size 1-2 wind slabs were triggered naturally and by skiers on Wednesday, mostly at alpine and treeline elevations.

Snowpack Summary

Recent snow has been heaviest in the north of the region, creating storm slabs. These sit above old wind slabs, scoured surfaces, a thin sun crust on sunny aspects and surface hoar in isolated sheltered and shady locations. Previous strong southerly and outflow winds created widespread wind slabs on a variety of slopes at alpine and treeline elevations. These may now be buried and hard to spot. A hard crust buried around February 12th, down about 50-80 cm, extends up to about 2000 m. A layer of surface hoar buried late in January remains a lingering concern. Shallow snowpack areas may also have a weak base of facets near the ground.

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