Boletín de aludes

Waterton Lakes

Feb 5 – 8, 2016Parks Canada
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Archivado · caducó 11 years ago

Peligro de aludes

Fri
Sat
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Lo esencial

New snowfall with high winds on Friday night will create Wind Slabs. Watch the freezing levels - the new load, and a rise in temperatures on Sunday, may also be enough to tickle a Deeply buried Persistent layer back to life.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–2
    Stubborn Wind Slabs exist lee to Westerly winds, and will increase in size and sensitivity by Saturday.

  • Loose Dry

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1
    Small loose dry avalanches are running naturally out of steep terrain.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–3
    Facets atop a deeply buried crust produced large avalanches in recent weeks, and are giving Sudden results in tests. The strength of this layer is highly variable across terrain, so a conservative approach to big terrain is crucial.

Weather Forecast

Flurries tomorrow, followed by upto 10cm of snowfall on Friday night, then a partial clearing late on Saturday morning. Strong Westerlies rise steadily to almost 100kph Friday night, then ease through Saturday afternoon. Sunday looks dry with Moderate Westerlies. Warm temperatures, cooling Friday night, then rising to near freezing on Sunday.

Snowpack Summary

5-10cm of new snow at upper elevations has formed soft Wind Slabs, lee to Moderate Westerly winds. These are currently stubborn to human triggering.  Buried below are older wind slabs, more difficult to trigger. Down 1m is a faceting rain crust. Though mainly requiring large triggers, any avalanche triggered on this would be large & destructive.

Avalanche Summary

Numerous small loose dry avalanches observed today from very steep terrain. One Size one Wind Slab observed today, at 2000m on an open, NE facing slope. On Sunday, a large, Deep Persistent slab avalanche was noted on the same slope... these are occurring on an occasional, but semi-regular, basis. They are large, and difficult to predict.

Confidence

Forecast snowfall amounts are uncertain on Saturday

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