Lawinenlagebericht

Kootenay Boundary

Dec 25 – 26, 2011Avalanche Canada
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Lawinengefahr

Tue
Wed
Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig
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Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2
    Watch out for wind slabs below ridge crests, behind terrain breaks, and in cross-loaded gullies. Wind slabs are expected to build in size over the next few days.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–3
    As new snow builds up, we can expect to see more avalanches failing on a buried surface hoar layer which exists in the upper snowpack.

Confidence

Fair - Intensity of incoming weather is uncertain

Weather Forecast

Monday: Light snowfall. Moderate south-westerly winds. Freezing level near valley bottom. Tuesday: 5-10cm. Freezing level around 1000m, rising later in the day. Strong westerly winds. Wednesday: 15-20cm, with the freezing level rising as high as 2000m. Strong westerly flow.

Avalanche Summary

Several natural and skier-triggered size 1 soft slabs were observed on Saturday. In uncompacted terrain, these were failing on the surface hoar interface buried in mid-December.

Snowpack Summary

Up to 20cm of new snow is bonding poorly to the old surface. A surface hoar layer from mid-December around 30cm down is giving sudden test results. Avalanche activity on the mid-December buried surface hoar layer has increased in the South Columbia region over the last two days as critical amounts of snow have been reached. I expect to see this trend of rising avalanche occurrences and increased size/consequence reach the Kootenay Boundary region soon. In some parts of the region, it's probably already occurring. Soft and hard wind-slabs can be found on certain slopes in the alpine and around treeline. Facets at the base of the snowpack could create a deep persistent slab problem that deserves attention in shallow snowpack areas on planar rocky slopes.

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