Bulletin d’avalanche

Northwest Coastal

Feb 25 – 26, 2015Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

New wind slabs may build on Thursday.  Use extra caution in wind-loaded terrain.  Are you a member of Avalanche Canada? Join today at avalanche.ca/membership

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    New wind slabs may form in leeward terrain features during Thursday's snowfall. Old wind slabs and unsupported cornices may still be lingering in isolated alpine areas but are generally not expected to be a concern.

Confidence

Fair - Intensity of incoming weather systems is uncertain

Weather Forecast

2-4mm of precipitation is expected Wednesday overnight with light-to-moderate alpine winds from the NW. Another 3-6mm is expected for Thursday. Freezing levels are forecast to reach around 1200m and alpine winds should remain light-to-moderate. On Friday, dry and clear conditions are expected as the ridge will re-establish over the region. Freezing levels are expected to be around 1200m and alpine winds moderate-to-strong from the NE. Saturday is currently forecast to be another day of full sun.

Avalanche Summary

On Tuesday, an explosive-triggered size 1 wind slab avalanche was reported.  On Monday, numerous wet releases up to Size 2 were reported from steep sun-exposed slopes. Isolated cornice failures and ice falls have recently been reported. Last week several full-depth avalanches up to Size 3 were observed on all but North aspects.  On Thursday, fresh wind slabs are the main concern.

Snowpack Summary

The snow surface is highly variable and may include wind-pressed surfaces or old wind slabs, a sun crust or old rain crust, surface hoar, and/or surface facets. A layer of surface hoar buried in the upper snowpack has been reported in some areas and is worth investigating before committing to any big alpine terrain. At the base of the snowpack, weak facets may persist.

Régions couvertes