Bollettino valanghe

Banff Yoho Kootenay

Dec 22 – 23, 2019Parks Canada
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Archiviato · scaduto 7 years ago

Pericolo valanghe

Mon
Tue
Alta quota
4 · Forte
Limite del bosco
4 · Forte
Sotto il limite
4 · Forte
Apri la mappa completa

In sintesi

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. 

Problemi valanghivi

  • Loose Dry

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Very Likely
    Dimensione
    1–2

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

  • Storm Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Very Likely
    Dimensione
    1–2.5

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

  • Deep Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    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

Regioni coperte