Bollettino valanghe

Northwest Coastal

Jan 30 – 31, 2012Avalanche Canada
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Archiviato · scaduto 15 years ago

Pericolo valanghe

Wed
Thu
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
Apri la mappa completa

Problemi valanghivi

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    2–6
    Widespread due to strong, shifting winds and large amounts of snow available for transport, but are generally lurking below ridgecrests, behind terrain features and in cross-loaded gullies. They can fail as very large, destructive avalanches.

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–6
    Large storm slab avalanches have been occurring for the past week and are expected to remain sensitive to triggers for the forecast period.

Confidence

Fair - Due to limited field observations for the entire period

Weather Forecast

A zonal flow is forecast through Wednesday with moderate to strong westerly winds and short-lived disturbances delivering 5 to 10 cm of snow each day, especially on the west (upslope) side of the ranges. Freezing level should remain near valley bottoms. Heavier precipitation is expected to start Wednesday evening when the next major system hits the coast which could bring another 30+cm by Thursday evening with freezing levels as high as 1200m.

Avalanche Summary

Reports are coming in about a widespread natural avalanche cycle that occurred on Saturday with avalanches up to Size 3.5 running almost full-path on all aspects and elevations. Natural and slope-cut activity continued on Sunday with avalanches up to Size 2 running within the upper storm snow on steep unsupported features and gullies at treeline and below. Explosive control on Sunday produced avalanches up to Size 3.5 all running on weaknesses within the recent storm snow.

Snowpack Summary

Total snowpack depths are well above average for this time of year and it won't stop snowing!Recent warm temperatures and upside-down storms created a touchy surface slab. Other weaknesses exist within and under the 150+cm of recent storm snow, but things seem so be settling rapidly. Strong winds associated with recent storms mean wind slabs on lee and cross-loaded terrain. Most snowpack concerns are limited to the surface layers, however large triggers such as cornice falls and smaller avalanche stepping-down could reawaken deeper persistent weaknesses.

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