Lawinenlagebericht

Kootenay Boundary

Feb 9, 2018Avalanche Canada
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Archiviert · abgelaufen 9 years ago

Lawinengefahr

Sat
Sun
Hochgebirge
4 · Gross
Waldgrenze
4 · Gross
Unterhalb
3 · Erheblich
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Kernpunkte

Special Avalanche Warning in effect for the interior ranges. Copy this address to view details: http://bit.ly/2nSOUyX

Lawinenprobleme

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    2–4
    The snowpack is complex and continues to produce very large avalanches on several weak layers buried below the surface.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely - Very Likely
    Größe
    1–3
    Storm slabs remain reactive on Friday. The first hit of sun will likely trigger loose dry avalanches which could step down to deeper layers initiating large and destructive avalanches.

Confidence

High -

Weather Forecast

Friday: Cloudy with sunny periods. Alpine temperatures near -11 and freezing levels dropping to valley bottom. Ridgetop winds light from the northeast.Saturday: Sunny. Alpine temperatures near -10 and freezing levels valley bottom. Light winds from the west.Sunday: A mix of sun and cloud. Alpine temperatures -7 and freezing levels rising to 800 m.

Avalanche Summary

On Thursday, avalanche control using explosives triggered numerous loose wet avalanches up to size 2 and a significant size 3 storm slab avalanche. These were reported from SE-SW slopes above 1900 m. The snowpack is complex, it requires patience and discipline. Natural avalanche activity may spike with the first hit of sun then start to taper off through the weekend, slopes will remain primed for human triggers.

Snowpack Summary

Recent snow accumulations vary showing 10-30 cm across the region adding more load and stress to the upper snowpack. This now brings 90-140 cm of settled snow over two surface hoar/ crust layers that were formed early to mid-January. Digging deeper 160-200 cm sits the mid-December surface hoar layer and near the base of the snowpack exists a crust/ facet interface which could be triggered by a large load like a step down avalanche or cornice failure.These persistent weak layers lurk within the snowpack and continue to be reactive, producing large and destructive avalanches. The snowpack is extremely complex and requires respect and diligence at this time.

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