Bollettino valanghe

Northwest Inland

Apr 2 – 3, 2013Avalanche Canada
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Archiviato · scaduto 13 years ago

Pericolo valanghe

Thu
Fri
Alta quota
2 · Moderato
Limite del bosco
1 · Debole
Sotto il limite
1 · Debole

In sintesi

Problemi valanghivi

  • Cornices

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Unlikely - Possible
    Dimensione
    1–6
    Large cornice falls continue to be reported from the region. Large cornices may become weak if the sun is shining.
  • Loose Wet

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible - Likely
    Dimensione
    1–3
    Loose wet avalanches are likely on south facing slopes if the sun is shining.

Confidence

Fair - Due to limited field observations

Weather Forecast

Synopsis: The upper ridge of high pressure rebuilds on Wednesday resulting in more sun through Thursday morning. The ridge gives way to a low pressure system later on Thursday bringing moderate precipitation and increasing winds. Wednesday: A mix of sun and cloud. The freezing level is around 1200 m and winds are light from the southwest.Thursday: Increasing cloud with light snow developing in the evening. The freezing level rises to 1400 m during the day and winds are generally light from the south. Friday: Moderate precipitation. The freezing level is near 1000 m.

Avalanche Summary

Numerous loose wet avalanches have occurred from steeper solar aspects up to size 2.0. Large cornice releases have also been noted.

Snowpack Summary

Surface snow has settled with the influence of warm temperatures and surface faceting continues on steep shaded alpine slopes. Solar aspects at all elevations and all lower elevation terrain are now well into a daily melt-freeze cycle with sun-exposed slopes becoming very weak with daytime warming. 30 - 60 cm of snow overlies a crust, old wind slabs or surface hoar layer buried on March 9th. The distribution of the surface hoar is also highly variable and it does not exist in every drainage. I would still remain cautious and continue to dig and test before diving into my line. Deeper in the snowpack, basal facets may resurface as a concern with continued mild temperatures.Cornices have become well-developed and could easily become unstable during periods of warm weather or direct solar radiation.

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