Bulletin d’avalanche

Northwest Inland

Jan 31 – Feb 1, 2023Avalanche Canada
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Archivé · expiré 4 years ago

Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible

Points saillants

Continually monitor the changing weather and snowpack conditions over the next few days. New snow may take some time to bond to the underlying layers.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2

    As new snow and westerly alpine winds arrive through the day expect soft slab development in exposed features, near ridges and high points. New wind slabs may overlay potentially weak layers or surface hoar, facets and/or crusts.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–3

    A number of buried weak layers remain possible to trigger. These layers appear to be most problematic in upper treeline and alpine elevations, in shallow, variable, rocky start zones.

Confidence

Moderate

Avalanche Summary

Backcountry users continue to report evidence of a significant avalanche cycle during the recent warm, wet, and windy weather last week. The majority of these avalanches were wind slabs, however, a number of avalanches stepped down to buried persistent layers, creating large, scary avalanches, like this one in the Telkwa area from Friday.

If you are out in the backcountry please consider filling out a Mountain Information Network report.

Snowpack Summary

New low-density snow overlays various wind-affected surfaces throughout the alpine and widespread, supportive, melt-freeze crusts at lower elevations (roughly 1900 m and below).

The mid and lower snowpack continues to bond and stabilize while a number of buried weak layers remain a concern and have produced a number of large recent avalanches.

Weather Summary

Monday night

Cloudy with flurries, 0 to 5 cm. Treeline temperatures -5 to -10 C. Strong west alpine winds.

Tuesday

Cloudy with flurries, 2 to 5 cm. Treeline temperatures -5 to -10 C. Moderate to strong southwest alpine winds.

Wednesday

Cloudy with snow, 5 to 10 cm. Treeline temperatures -5 to -10 C. Moderate southwest alpine winds.

Thursday

Cloudy with flurries, 2 to 5 cm. Treeline temperatures -5 to -10 C. Strong southwest winds.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Wind slabs are most reactive during their formation.
  • Wind slabs may be poorly bonded to the underlying crust.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.

Régions couvertes