Boletín de aludes

Northwest Inland

Mar 21 – 22, 2012Avalanche Canada
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Archivado · caducó 15 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

The avalanche danger will rise during the day if the forecast for strong solar radiation holds true.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    New wind slabs may be triggered in exposed lee and cross-loaded features.

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–6
    Large cornices exist in alpine terrain. A failure could be destructive by itself, and could also trigger an avalanche on the slope below.

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    Loose wet avalanches are likely in steep south-facing terrain if the sun is shining.

Confidence

Fair - Due to limited field observations

Weather Forecast

Thursday: A mix of sun and cloudy with a chance of flurries - 2-5cm. The freezing level should rise to 800m during the day. Winds are moderate from the southeast. Friday and Saturday: A ridge of high pressure builds in giving drier and sunnier conditions. The freezing level bounces from valley bottom overnight to around 1000m during the day. Winds are generally light from the south.

Avalanche Summary

No new slab avalanches have been reported in the past day or two, although observations were quite limited on Tuesday. There were a few reports of cornice failures on the weekend, but most did not trigger slabs.

Snowpack Summary

Up to 25cm of new snow covers the previous surface which included a sun crust on southerly aspects, surface facets or surface hoar in cool shady areas, and pockets of wind slab in exposed terrain. Moderate southerly winds have created new wind slabs in lee and cross-loaded terrain. The mid February persistent weak layer interface, comprised of spotty surface hoar, facets and crusts, is buried 80-120 cm below the surface. No recent activity has been reported on this interface. However, recent snowpack tests have been giving hard but sudden "pop" results and indicate it is has the potential to react given the right trigger in the right place. For route selection, it should still be on your radar and is more likely to be triggered on steeper, unsupported terrain. Cornices in the area are reported to be very large and primed for natural collapse or triggering by a person.

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