Boletín de aludes

Waterton Lakes

Mar 18 – 20, 2014Parks Canada
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Archivado · caducó 13 years ago

Peligro de aludes

Wed
Thu
Alta montaña
3 · Notable
Límite del bosque
2 · Moderado
Bajo el límite
2 · Moderado
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Lo esencial

New snow on top of crusts and rain soaked snow are adding to an already complex snowpack. The hazard will be higher on South facing slopes if there is significant solar radiation Tue. Hazard will also increase Wed depending on snowfall amounts.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    Previous windslabs are lurking just under the surface and now there is a lot of snow available for transport to start building new ones.

  • Storm Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–2
    The 30-40cm of snow from the last few days is sitting on crusts or moist snow that could provide a poor bond. Daytime heating could trigger these instabilities on south facing aspects but they may persist on cooler north aspects for a few days.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely
    Tamaño
    1–3
    The chance of triggering the deep weak layers from early February are diminishing but these layers have not completely disappeared. Any slope that have not slid should be suspect for possible large destructive avalanches.

Weather Forecast

After receiving 30-40cm over the last 48hr the snowfall will taper off tonight. Tue will be a bit of a lull but then the next system arrives on Wed with possibly another 25cm by Fri. Temperatures will be cooler, with daytime highs in the -5 to 10 ranger. Winds will return to the Waterton 'normal' of strong westerlies for the forecast period.

Snowpack Summary

Sundays rain left moist snow and crust that are now 30-40 under the surface. Below 1900 there is a complex of crusts and moist snow 40-45cm thick. Above 1900m the crusts are more discrete, with dry snow in between. The Feb facet layer is still persistent, down 70-180cm and could still be reactive in places that have not already gone.

Avalanche Summary

Not much avalanche activity has been seen Sun/Mon because of poor visibility. A long audible avalanche was heard off the back of Cameron Lake on Mon. This was likely the storm snow running on the Mar 14 melt freeze crust.

Confidence

Intensity of incoming weather systems is uncertain on Wednesday

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