Lawinenlagebericht

Kootenay Boundary

Mar 8 – 9, 2013Avalanche Canada
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Archiviert · abgelaufen 14 years ago

Lawinengefahr

Sun
Mon
Hochgebirge
3 · Erheblich
Waldgrenze
2 · Mässig
Unterhalb
2 · Mässig
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Kernpunkte

Lawinenprobleme

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely - Possible
    Größe
    2–6
    The 80 cm deep surface hoar/sun crust weak layer could be triggered by a cornice fall or an avalanche stepping down from the storm snow. Be aware of the sun and warmth weakening the snowpack and cornices.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–4
      Up to 30 cm of recent snow is sitting on a melt freeze crust and has formed touchy storm slabs.

  • Loose Wet

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–4

Confidence

Poor - Timing, track, or intensity of incoming weather is uncertain on Sunday

Weather Forecast

Friday night and Saturday:  The dominating feature is a ridge of high pressure over the whole province bringing warmer air (-1 in the alpine), freezing levels rising to 1700 m., clear skies and light NW winds. Sunday: The ridge is breaking down in the North and remains in the Southern part of the interior range. There is a chance of light precipitation for Sunday (5-10 mm) with winds picking up in the moderate range from the W. Temperatures are slightly cooler than Saturday.Monday: Another system which could deliver more precipitation is expected for Monday but the timing and intensity is still uncertain.

Avalanche Summary

Several soft slabs size 1 and 1.5 were triggered by skiers in the new snow (20-30 cm deep) and was running on the underlying crust or on the older snow interface.  There was also several reports of sluffing in steep terrain.

Snowpack Summary

Warm temperatures and solar radiation forecasted for tomorrow will weaken the surface layer possibly triggering the recent storm slab (between 20-30 cm deep). This recent snow is sitting on an older snow interface above 2000 m. and on a melt freeze crust below that elevation. In much of the region, up to 80 cm snow overlies fairly well preserved surface hoar and sun crust. This interface is still producing sudden collapse results during snow tests.  A cornice fall or an avalanche in the storm snow could definitely trigger this deeper instability, especially where the melt freeze crust does not exist above 2000 m.

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