Boletín de aludes

Jasper

Apr 27 – 28, 2017Parks Canada
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Archivado · caducó 9 years ago

Peligro de aludes

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

Pay close attention to freezing levels as we move into spring-like conditions. The avalanche danger will increase with rain, solar exposure and daytime heating.

Problemas de aludes

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    2–3
    Cornice failures are still being noted periodically on West aspects 2500-2800m.

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–2
    Freezing overnight temperatures decrease the danger in the morning until it warms up increasing the hazard. Most widespread during the late afternoon on solar facing slopes. Sluffs from rocks can trigger large slides once the snow is wet.

  • Deep Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    2–4
    The deep instability is well bridged by a solid mid-pack; however, it could be triggered by a cornice failure.

Weather Forecast

With the Jet Stream to the South cool temps dominate to the weekend. Snowfall or rain will tapper off by Friday AM. With freezing levels descending to the valley bottom  snowpack overnight recovery will be good. Winds remaining light N to W. Daytime freezing levels will be close to 2,000m,

Snowpack Summary

On Northerly facing slopes above treeline up to 20 cm of loose new snow sits over a well consolidated upper snowpack. Melt freeze crusts are ubiquitous to treeline above which their distribution narrows to solar slopes up to 2600m. The mid-pack is consolidated and bridges the weak base. The bottom snowpack is a mix of weak facets and depth hoar.

Avalanche Summary

Avalanche activity will increase with thermal inputs such as rain, direct solar radiation and daytime warming. During the morning and after a good nights freeze the danger will gradually increase during the day. Typically it will be at it's greatest from 14:00. Likely trigger spots are from shallow rocks, cliffy terrain and shallow snowpack areas.

Confidence

Freezing levels are uncertain on Sunday

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