Lawinenlagebericht

Kootenay Boundary

Dec 18 – 19, 2012Avalanche Canada
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Archiviert · abgelaufen 14 years ago

Lawinengefahr

Thu
Fri
Hochgebirge
3 · Erheblich
Waldgrenze
3 · Erheblich
Unterhalb
2 · Mässig
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Kernpunkte

Lawinenprobleme

  • Loose Dry

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–5
    Loose dry snow remains unconsolidated in terrain that is protected from the wind. There is a lot of new snow; sluffing may entrain enough snow to bury a skier/rider.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Very Likely
    Größe
    2–5
    The new storm is expected to develop a thick slab on all aspects and at all elevations. Recent light snow may also be transported by forecast strong Southwest winds into deep wind slabs on North thru East aspects.

Avalanche Summary

Natural soft slab and loose snow avalanches up to size 2.0 were reported to be releasing down 30-50 cms in the storm snow. Large explosive triggers released loose snow avalanches up to size 2.5 in the Kootenay Pass area.

Confidence

Good

Weather Forecast

Overnight and Wednesday: A weak ridge of High pressure will continue to cause cold and dry conditions during the day. The next Pacific frontal system is expected to move into the region by Wednesday afternoon. Light Westerly winds will become moderate Southwesterly as the storm moves in and brings 15-20 mm of precipitation, that should be snow (20-30 cms) at all elevations.Thursday: Strong Southwest winds and another 10-15 mm of precipitation for southern areas of the region. Freezing level should remain at valley bottoms.Friday: Flurries and gusty Northwest winds as a cold arctic airmass moves in from the Yukon.

Snowpack Summary

The storm brought another 20-40 cms of dry light snow combined with moderate to strong Southwest winds. The storm slab has been very easy to trigger in areas where the wind stiffened the slab a bit. In most places the slab is still soft to very soft and it is not propagating far. Expect heavy sluffing in steep terrain. The well settled mid-pack has not been showing shears in snow profile tests.

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