Lawinenlagebericht

Banff Yoho Kootenay

Dec 8 – 9, 2015Parks Canada
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Archiviert · abgelaufen 11 years ago

Lawinengefahr

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

Recent snow on the Icefields Parkway is making for excellent skiing! We are expecting a juicy storm starting Tuesday around noon which will raise the danger. If it doesn't materialize as forecast, the danger rating may be lower.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible - Likely
    Größe
    1–2
    15-40 cms of storm snow in the alpine and at treeline is being blown by moderate to strong S/ SW winds and forming windslabs in immediate lees of prominent features and ridgelines.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1–2
    15 - 45 cm's of new snow is slowly settling into a cohesive slab. This slab will be most reactive in deeper snowpack areas where there is more than 30 cm's of new snow and below 2000m where it overlies the Dec. 3rd surface hoar or facets.

Weather Forecast

The next storm is forecast to bring 15 - 30 cm's starting Tuesday around noon followed by a smaller system bringing 5-10 cm's starting on Wednesday at noon with the highest amounts near Bow Summit. Moderate to strong W winds will continue in the alpine and freezing levels peak Tuesday around 1700m with the influence of the south westerly flow.

Snowpack Summary

The Dec 3rd interface is now buried by 30-50 cm of storm snow and is a layer to watch right now. This interface consists of facets and large surface hoar below 2000m, wind effect in the alpine, and suncrusts on steep S and SW aspects. Moderate S and SW winds are building soft slabs in the lee of alpine features. The lower snowpack is well settled.

Avalanche Summary

Small windslabs local to ridgecrests are reactive to skier traffic in the alpine and at treeline. Some cracking observed in a steep below treeline glade today where the Dec. 3rd surface hoar was present. Limited observations in the alpine due to poor visibility.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

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