Boletín de aludes

Northwest Coastal

Apr 11 – 12, 2017Avalanche Canada
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Archivado · caducó 9 years ago

Peligro de aludes

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

Strong easterly winds on Tuesday-Wednesday may result in unusual snow loading patterns. Cornices are large and remain a significant concern.

Problemas de aludes

  • Wind Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–2
    Small amounts of new snow and moderate to strong east winds may result in unusual loading patterns in lee features below ridgetops.

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible
    Tamaño
    1–3
    Large cornices may become weak with daytime warming and have the potential to trigger slabs on the slopes below.

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

Light precipitation and STRONG easterly winds on Tuesday-Wednesday. Unsettled weather and cool temperatures thereafter. WEDNESDAY: Mix of sun and cloud with isolated flurries (0-5cm). Strong easterly ridgetop winds. Freezing level around 1500 m.THURSDAY: Mainly cloudy with isolated flurries (2-5cm). Moderate southeasterly ridgetop winds. Freezing level around 1400 m.FRIDAY: Cloudy with scattered flurries (3-5cm). Light southerly ridgetop winds. Freezing level around 1300 m.

Avalanche Summary

On Monday, several loose wet avalanches to Size 2.5 were reported in the afternoon with solar input. In the north of the region a cornice failure on a northwest aspect resulted in a slab avalanche, Size 3.0.

Snowpack Summary

Small amounts of new snow (up to 10cm) fell at higher elevations in the past few days with light to moderate southerly winds. The new snow will likely be sitting on hard surfaces created by strong winds last week, or melt-freeze crusts below 1400m.Sunny breaks and warmer temperatures on Sunday & Monday has likely left a supportive temperature crust on all aspects up to treeline. North facing alpine slopes reportedly have up to 10cm dry powder, on a firm crust. A weak layer of facets and crusts from late February are buried 100-120 cm down. The layer has been unreactive recently and has a variable distribution. That said, rapid warming of the snowpack or a large trigger, such as a cornice, may still have the potential to trigger it.

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