Lawinenlagebericht

Banff Yoho Kootenay

Dec 22 – 23, 2019Parks Canada
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Lawinengefahr

Mon
Tue
Hochgebirge
4 · Gross
Waldgrenze
4 · Gross
Unterhalb
4 · Gross
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Kernpunkte

Clearing skies and new snow will lure people back into the mountains, but stay out of avalanche terrain and away from the runouts of large paths.

Avalanche control on Mounts Whymper, Simpson, Wardle Sunday.  No activities there during that time. 

Lawinenprobleme

  • Loose Dry

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Very Likely
    Größe
    1–2

    In the short term this will be a problem, especially in gully features and off of sidewalls.

  • Storm Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Very Likely
    Größe
    1–2.5

    Storm slabs will be everywhere and will remain reactive while the snowpack adjusts to the new load.

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Likely
    Größe
    2–3.5

    The weak, faceted mid and lower pack is overloaded by the new storm snow at all elevations.  Lots of uncertainty surrounds this layer, but if triggered it would result in a large avalanche. 

Weather Forecast

The end of the storm is coming Saturday night.  Temperatures will be in the -10C range Sunday, and winds will be light from the West with a few lingering flurries and cloud. Temperatures will continue to cool through the beginning of next week.

Snowpack Summary

30-70cm of warm, wet snow in the past 48hrs with moderate to strong S/SW winds.  Storm slabs have formed at all elevations and aspects. Below the new snow the snowpack structure is generally weak, consisting of facets and depth hoar and a Nov crust up to 2500m.  These weak layers are getting overloaded with all of the new snow. 

Avalanche Summary

Visibility has been very limited but there have been avalanches up to size 3 in various locations.  We suspect a good sized avalanche cycle is occurring.

Confidence

Due to the number and quality of field observations

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