Bulletin d’avalanche

North Columbia

Feb 5, 2019Avalanche Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

Natural avalanche activity has slowed down, but human triggered avalanches remain likely, especially in wind loaded areas and at lower elevations where a buried surface hoar layer has produced avalanches recently.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    30-80 cm of recent snow has been redistributed by recent winds in many areas, forming wind slabs on all aspects due to shifting wind directions.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1.5–3
    50-100 cm of snow is now sitting on a persistent weak layer of surface hoar and crust that was buried in mid January. This region has been the "hot spot" of activity on this layer, with more reactivity reported here than in neighboring regions.

Confidence

Moderate -

Weather Forecast

MONDAY NIGHT - Clear periods / northwest winds 10-15 km/h / alpine low temperature near -17TUESDAY - A mix of sun and cloud / northeast winds 10-15 km/h / alpine high temperature near -15WEDNESDAY - Mainly sunny / northwest winds 15-25 km/h / alpine high temperature near -15THURSDAY - Cloudy with flurries, 5 cm / southwest winds, 15-35 km/h / alpine high temperature near -13

Avalanche Summary

Natural avalanche activity slowed to some degree on Sunday. Several natural avalanches to size 2.5 were reported. Human triggered avalanches to size 2.5 were also reported, many of these were triggered remotely (from a distance). Most of these failed on a persistent weak layer that was buried in mid January.Widespread avalanche activity was reported on Friday and Saturday. Numerous natural and explosives triggered avalanches to size 3.5, and human triggered avalanches to size 2 were reported. Many of these avalanches were triggered remotely (from a distance) and failed on the mid January layer.Human triggered avalanches failing on the mid January persistent weak layer have been reported almost daily for the past two weeks in the North Columbia region.

Snowpack Summary

30-80 cm of recent new snow sits on surface hoar (feathery crystals), facets (sugary snow), wind slabs and a crust on sun-exposed slopes. In many areas, recent winds have redistributed the new snow, forming wind slabs on all aspects due to shifting wind directions.A persistent weak layer that was buried in mid January is now buried 50-100 cm. This layer consists primarily of surface hoar, however there is also a crust associated with it on sun-exposed slopes. This layer has been most reactive at treeline and below, and was very reactive during the height of the recent storm.

Régions couvertes