Bulletin d’avalanche

Purcells

Apr 26 – 27, 2014Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Mon
Tue
Alpin
Sans niveau
Limite forestière
Sans niveau
Sous la limite
Sans niveau
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Points saillants

We are no longer issuing danger ratings for this region due to a lack of field data.Please refer to this blog post for more insight into managing the current conditions.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    New snow amounts are extremely variable across the region with the highest amounts falling in the south. Moderate winds have redistributed new snow and wind slabs may be found in lee features. Expect touchy conditions when the sun comes out.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    Expect loose wet avalanches in steep terrain if it is raining or during sunny periods, especially if the sun or rain is affecting fresh snow.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    3–6
    The potential for very large deep slab avalanches needs to remain on your radar. Cornice fall, warming temperatures or a smaller wet or wind slab avalanche in motion could act as triggers.

Confidence

Poor - Due to the number of field observations

Weather Forecast

Sunday: A relatively cool unstable air mass will continue to bring showers or flurries to the region with light to locally moderate accumulations. Winds should remain light to moderate from the southwest with freezing levels hovering around 1600m.Monday: Scattered flurries are expected throughout the day, although some clearing is expected by late afternoon as a dry ridge of high pressure starts to develop. Winds are expected to be light from the northwest with freezing levels at about 1700m.

Avalanche Summary

Expect loose wet avalanches in steep terrain if it is raining or during sunny periods, especially if the sun or rain is affecting fresh snow. Spring squalls may bring locally heavy precipitation and new storm or wind slabs may develop in higher terrain if you see significant new snow accumulation. Cornices collapses have been reported during periods of daytime warming. Occasionally these heavy triggers have caused large deep slab avalanches on the slopes below.

Snowpack Summary

This is a broad general summary of conditions in the region. This summary is based on limited field data and should be supplemented with local observations to help assess avalanche danger.Over the past week or so the Purcells have seen moderate amounts of new snow mixed with showers or periods of rain below 1600-1800 m. Southerly winds have likely formed pockets of wind slab at higher elevations in lee of ridges and terrain features. The upper snowpack generally consists of layers of moist and/or dry snow mixed with several well bonded crusts.The mid-February facet layer is typically down 80 - 180cm. Direct triggering of this layer has become unlikely, however, cornice fall, a smaller avalanche in motion or prolonged warming may wake this layer up. The resulting avalanche would be very large and destructive.Weak basal facets can be found in many areas, however triggering this layer is unlikely.

Régions couvertes