Bollettino valanghe

Kootenay Boundary

Dec 10 – 11, 2015Avalanche Canada
Vedi sulla mappa
Archiviato · scaduto 11 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

The slopes with the best riding conditions are also the most dangerous - steep alpine slopes

Problemi valanghivi

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    2–5
    Storm snow weaknesses in the top metre remain sensitive to human triggers. These storm and wind slabs will be particulary deep and touchy on the downwind side of ridge crests and in wind-loaded gullies in exposed areas at higher elevations.

Confidence

Low - Due to the number of field observations

Weather Forecast

Friday: Mainly cloudy with light snow flurries bringing up to 5 cm of snow. Freezing levels in valley bottoms and light southerly ridgetop winds. Saturday: Increasing snowfall with 10-15cm possible by Sunday morning. Freezing levels in valley bottoms and light southwesterly becoming moderate to strong southerly ridgetop winds. Sunday: Another 5-10cm possible with freezing levels peaking at 1400m and moderate southerly easing to light southwesterly ridgetop winds.

Avalanche Summary

Reports from Wednesday include numerous natural and skier-controlled 20-90cm thick storm slab avalanches up to Size 2 primarily on east through northeast aspects as low as 1600 m.

Snowpack Summary

Recent heavy rain to treeline elevations and wet snow above saturated and loaded the upper snowpack, forming a thick crust which now has up to 20cm fresh snow on top (with perhaps a thin crust within it). Weaknesses linger within the recent snow as well as at deeper old snow surface interfaces, which consists of facets, surface hoar, and/or a crust at upper elevations (especially on southerly aspects). The most critical of these is surface hoar buried early December (now likely down 50-100cm), which has the potential for remote triggering, extensive releases and prolonged sensitivity to triggers. It is likely lurking in most sheltered areas treeline and below. The thick mid-November crust is just under this weakness.

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