Boletín de aludes

Kootenay Boundary

Feb 15 – 16, 2015Avalanche Canada
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Archivado · caducó 12 years ago

Peligro de aludes

Tue
Wed
Alta montaña
2 · Moderado
Límite del bosque
2 · Moderado
Bajo el límite
1 · Débil
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Lo esencial

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Problemas de aludes

  • Cornices

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–3
    Cornices are large and may have been weakened by recent warming. Strong solar radiation may cause natural cornice falls.

  • Persistent Slabs

    • Alta montaña
    • Límite del bosque
    • Bajo el límite del bosque
    Probabilidad
    Unlikely - Possible
    Tamaño
    1–5
    The persistent weak layer of buried crust and surface hoar from the beginning of February should become less likely to trigger as cooler temperatures provide overnight freezing down to valley bottoms. Watch for warming from strong solar radiation.

Confidence

Fair - Timing or intensity of solar radiation is uncertain

Weather Forecast

There is no precipitation in the forecast. The freezing level should drop down to the valley bottoms overnight and then rise up to about 1500 metres during the day on Monday. This pattern is expected to continue for Tuesday and Wednesday. The only uncertainty is how much sun we will see over the next few days. There is a chance of valley cloud and high cloud each day.

Avalanche Summary

On Saturday there was one loose wet avalanche size 2.0 that released from a steep northeast aspect at treeline. I suspect that cooler alpine temperatures and the re-freezing has reduced the likelihood of triggering deeply buried weak layers. Some loose wet avalanche activity may continue if we see strong solar radiation.

Snowpack Summary

Alpine temperatures dropped down to about -7 overnight and the freezing level dropped down close to valley bottoms. This cooling down of the snowpack is expected to develop new melt-freeze crusts on the surface and reduce fracture propagations at buried weak layers. During the warm-up we found approximately 65-100 cm of recent storm snow that is bonding well to a crust buried at the beginning of February; however, this bond is much weaker where surface hoar overlies the crust. Below that, recent snowpack tests gave moderate to hard but sudden collapse results on the mid-January surface hoar where it was found down 70-80 cm on a northeast facing treeline slope. This persistent weakness has been found as deep as 110 cm, or deeper on wind-loaded slopes. The mid-December crust/facet/surface hoar weakness may be persisting in the mid to lower snowpack at higher elevations.

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