Lawinenlagebericht

Jasper

Nov 27 – 28, 2017Parks Canada
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Archiviert · abgelaufen 9 years ago

Lawinengefahr

Tue
Wed
Hochgebirge
4 · Gross
Waldgrenze
4 · Gross
Unterhalb
3 · Erheblich
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Kernpunkte

Icefields Parkway is closed from Saskatchewan Crossing to Athabasca Falls due to planned avalanche control. Check Alberta 511 for updated opening time.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–2
    Sensitive wind slabs building quickly at ridge tops and if triggered, has the potential to step down to the deeper instability.

  • Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    2–3
    This is a complex problem which is hard to assess and predict. Give yourself a wide margin and make conservative terrain choices.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    1–3
    Building slabs over the Black Friday (Nov. 23rd) crust will continue to grow overnight and become more sensitive to light triggering by Monday morning. Extremely cautious travel is advised until the hazard subsides. 

Weather Forecast

15cm of storm snow with a further 15 to 20 cm forecasted overnight for Sunday. Snow to continue through until Tuesday afternoon. Cool alpine Temperatures up to -5. Strong to Moderate SW winds with gusty extreme winds to accompany this the remainder of the storm cycle.

Snowpack Summary

30cm of recent storm snow over a 10cm hard crust with more coming. A persistent slab between 40cm - 150cm thick sits on the Halloween Crust, low in the snowpack. This crust can be found up to 2,700m depending on its location. Wind and storm slabs likely exist in the upper alpine.

Avalanche Summary

Field team on Sunday monitoring growing storm slab over the Black Friday crust down 35cms. No new avalanches observed on the crust but visibility poor above TL. On Nov. 22nd a field team remote triggered 3 simultaneous size 2 persistent slabs 60-150m away on either side of the wind scoop at parkers ridge.

Confidence

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