Boletín de aludes

Kootenay Boundary

Apr 2 – 3, 2016Avalanche Canada
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Archivado · caducó 10 years ago

Peligro de aludes

Mon
Tue
Alta montaña
3 · Notable
Límite del bosque
3 · Notable
Bajo el límite
2 · Moderado
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Lo esencial

Choose your route to avoid exposure to sun-baked terrain and slopes overhung by cornices.

Problemas de aludes

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Possible - Likely
    Tamaño
    1–5
    Large fragile cornices threaten many slopes. A cornice fall could trigger a large avalanche on the slope below.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely
    Tamaño
    3–6
    Persistent slabs may wake up with the prolonged warming, or be triggered by cornice fall.

  • Loose Wet

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Likely
    Tamaño
    1–3
    Loose wet avalanches are likely on all steep slopes, especially those getting baked by the sun. Wet slabs are possible too.

Confidence

Moderate - Timing or intensity of solar radiation is uncertain on Sunday

Weather Forecast

Sunday is expected to remain warm, with the freezing level around 2400 m. Clouds and isolated convective showers are possible.  A front passing through on Monday is expected to bring around 10-20 mm precipitation and moderate SW winds, with the freezing level falling from around 2500 m to 1500 m. Cloud and a few snow showers may linger on Tuesday.

Avalanche Summary

A natural cycle of size 1-2 loose wet avalanches appeared to slow down on Friday, but an explosives control mission near Nelson produced several size 2-3 wet slab avalanches.

Snowpack Summary

Large cornices overhang alpine slopes and threaten to trigger avalanches on slopes below. These are likely to be fragile due to the warm weather. The snow surface is moist up to at least 2000 m on all aspects and may still be dry on shady aspects at higher elevations. At low elevations, the snowpack is isothermal. The late February surface hoar/ crust interface (down 80 to 130 cm) remains a low probability/ high consequence concern. Test results are variable, with occasional sudden planar (pop) results. While generally becoming unlikely to trigger, this layer could produce surprisingly large and destructive avalanches with a cornice fall or warm temperatures.

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