Bulletin d’avalanche

Northwest Inland

Mar 3, 2017Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

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

Wind slabs are more reactive in locations West of  Hankin-Evelyn and the Telkwa due to higher snowfall amounts and stronger ridgetop winds.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    Gusty SW winds at upper elevations have formed fresh wind slabs on leeward slopes and behind terrain features. Loose dry avalanches may be easily triggered below treeline or in areas sheltered from the wind.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    2–4
    A lingering weakness at the bottom of the snowpack may remain sensitive to human triggering, especially in shallow snowpack areas. Smaller avalanches in motion also have the potential to step down and trigger deep persistent slabs.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

Friday: Mix of sun and cloud with a trace of new snow. Ridgetop winds light from the South and alpine temperatures near -9.Saturday: Mostly cloudy with isolated flurries. Ridgetop winds light from the SE and alpine temperatures -10. Sunday: Cloudy with sunny periods and an alpine high of -12.

Avalanche Summary

On Wednesday, numerous natural storm slabs up to size 1.5 were reported from the western part of the region and no avalanche activity reported from the Telkwa riding locations. Isolated wind slabs may be found in alpine locations on leeward slopes.

Snowpack Summary

Recent low density storm snow up to 25 cm has fallen with surprisingly little wind effect. The new snow has buried a variety of old snow surfaces including stiff wind slabs, facets, crusts and surface hoar. The new snow may have a poor bond to these interfaces. At treeline elevations the average snowpack depths are 120-190 cm and a well consolidated mid-pack of approximately up to 100 cm sits above weak basal facets (sugary snow) near the ground. Recent snowpack testing has shown sudden easy results down 25 cm on a surface hoar layer and sudden hard results down 100 cm within the facetted snow. The deeper basal weakness remain a concern, especially from thin rocky start zones and shallower snowpack locations.

Régions couvertes