Bollettino valanghe

Northwest Coastal

Dec 11 – 12, 2014Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 12 years ago

Pericolo valanghe

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

In sintesi

A gradual improvement in avalanche danger is expected over the weekend.

Problemi valanghivi

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    2–5
    Recent storm snow may bond poorly and could overload deeper weaknesses in the snowpack. Extreme southerly to easterly winds also created particularly deep and weak wind slabs on leeward slopes well below ridge tops.

Confidence

Fair - Due to the number of field observations

Weather Forecast

Expect a change to cooler conditions on Friday and through the weekend. Light to locally moderate snowfall is expected on Friday, tapering off on Saturday. Winds remain light to moderate from the south-west.

Avalanche Summary

A naturally triggered avalanche cycle was observed on Tuesday and Wednesday. At low elevations, many of these were wet and dug deep, failing to ground, up to size 2.5. At treeline and above, storm slabs and wind slabs were reported. In the north, large explosives triggered slabs up to size 3 failing on the November crust layer, with wide propagations at alpine elevations.

Snowpack Summary

Heavy rain which recently saturated the upper snowpack resulted in wet, loose, and cohesionless surface snow as high as alpine elevations in the southern part of the region. As freezing levels drop, this may freeze into a solid surface crust with fresh wet snow stuck on top, depending on elevation. Meanwhile in the high alpine and as low as treeline elevations further north, as much as 70 cm of recent snow and wind has formed new storm slabs. These have overloaded previous weaknesses buried within the snowpack, such as the mid-November crust-facet layer.

Regioni coperte