Bollettino valanghe

Northwest Coastal

Jan 26 – 27, 2012Avalanche Canada
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Archiviato · scaduto 15 years ago

Pericolo valanghe

Sat
Sun
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
3 · Marcato
Apri la mappa completa

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    3–6
    Large new and old wind slabs can be found on many slopes. Further wind slab development is likely over the next few days.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Very Likely
    Dimensione
    3–7
    A weak layer in the snowpack is getting progressively more deeply buried with storm snow. Rising temperatures during the weekend will increase the likelihood of storm slab avalanches, which could be very large.

Confidence

Fair - Timing of incoming weather is uncertain

Weather Forecast

Friday: Snow overnight Thursday should give way to light snow or flurries on Friday. Freezing level near valley floor. Light to moderate winds.Saturday: Heavy precipitation (very heavy near the coast) with the freezing level climbing to 1200m by afternoon. Strong to gale westerly winds. Sunday: Moderate snow, tapering off by afternoon. Moderate to strong westerly winds. Freezing level dropping by afternoon.

Avalanche Summary

A natural avalanche cycle to size 3 was observed on Wednesday. Many avalanches failed on a facet/crust layer about 80cm deep, which is likely to continue to be a problem sliding layer as the next pulse of storm precipitation rolls in. Below treeline, moist loose avalanches were releasing in response to warming or rain.

Snowpack Summary

Roaring winds from the west and south-west have created new wind slabs at all elevations. Older, buried wind slabs were formed from northerly winds. Fluctuating freezing levels have led to a melt-freeze crust below treeline. Dynamic weather will continue to affect the region through the weekend, which is likely to cause further wind slab and storm slab development. Of concern in the snowpack is a buried crust/facet layer (down about 80cm) which is getting an ever-increasing load above it. It is beginning to produce destructive avalanches in some areas as a critical balance is reached.

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