Bollettino valanghe

South Coast Inland

Nov 25 – 26, 2017Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 9 years ago

Pericolo valanghe

Mon
Tue
Alta quota
4 · Forte
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
Apri la mappa completa

In sintesi

A natural avalanche cycle is expected on Sunday with rain set to batter the snowpack. Conditions will be especially dangerous where rain falls on dry snow. This will certainly be the case at high elevations in the south of the region.

Problemi valanghivi

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Very Likely
    Dimensione
    1–3
    Rain will be a powerful trigger for slab avalanches on Sunday as it rapidly loads and warms the upper snowpack where dry snow lies on the surface. Touchy new slabs may also form at higher elevations in the region's north as rain transitions to snow.

  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely - Very Likely
    Dimensione
    1–3
    Warm, wet weather will destabilize surface snow and encourage loose wet avalanching on Sunday, especially in steep terrain. Even a small release can develop into a very dangerous problem as it gathers mass traveling downslope.

Confidence

Moderate -

Weather Forecast

Sunday: Approximately 20mm of rain in the south of the region with 10-15 cm of new snow at alpine elevations in the north. Rain below about 1700 metres. Strong south winds. Freezing level ranging from 2000-2200 metres with alpine temperatures from +3 in the south to around 0 in the north.Monday: Mainly cloudy with isolated flurries and a trace of new snow in the north of the region. A possible 5 cm of new snow in the south. LIght to moderate southwest winds. Freezing level to around 1200 metres with alpine temperatures of -5 in the north of the region and -3 in the south.Tuesday: Cloudy with scattered flurries and approximately 5 cm of new snow at higher elevations. Rain below about 1200 metres. Strong southwest winds. Freezing level to about 1600 metres with alpine temperatures from about -1 in the south of the region to -3 in the north.

Avalanche Summary

No new avalanches have been reported, however new storm slabs developed at upper elevations in the south of the region over last week's stormy weather. Please post your observations to the Mountain Information Network. (MIN)

Snowpack Summary

Up to 10 cm of new snow lies on the surface above about 1300 metres in the north of the region, with up to 35 cm in the south. Recent southerly winds have redistributed the new snow into wind slabs in lee terrain. Areas that received more snow may still be presenting a more generalized storm slab problem on all aspects. Below the new snow, last week's warm and wet weather saturated the snowpack with rain. This will have refrozen into a strong capping crust below the new snow at higher elevations but may remain moist below treeline and into the valley bottom. Below this variable crust interface the heavy rain eroded snowpack depths significantly, leaving behind a rain-soaked and relatively uniform 90 cm at treeline elevations throughout the region.

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