Bulletin d’avalanche

Northwest Coastal

Jan 3 – 4, 2014Avalanche Canada
Voir sur la carte
Archivé · expiré 13 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
Ouvrir la carte complète

Points saillants

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–5
    Shallow snowpack areas in the North of the region may continue to have persistent weak layers of surface hoar and/or a facetted crust near the ground.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–5
    Strong winds during the storm developed deep pockets of wind transported snow on North thru Southeast facing slopes in the alpine and at treeline. Moderate to strong Northwest winds after the storm may reverse load some Southerly aspects.

Confidence

Fair - Due to the number of field observations

Weather Forecast

Overnight and Saturday: Broken skies overnight with some clear periods or high clouds during the day. Cooler more seasonal temperatures with freezing levels dropping down to near sea level overnight and then rising to about 200 metres during the day. Moderate Northwest winds and no precipitation forecast.Sunday: A mix of sun and cloud with no precipitation. Light South winds becoming moderate as warm air moves in from the Pacific. Freezing level may rise to ridgetops.Monday: Overcast with moderate Southwest winds and warm air trapped at higher elevations.

Avalanche Summary

No recent natural avalanches have been reported.

Snowpack Summary

In general the snowpack seems shallower and more faceted in the northern part of the region, and deeper with more wind and storm slab problems in the south. A significant amount of recent storm snow is settling rapidly, but will likely remain unstable for at least a few days after the weather clears. However, persistent weaknesses including facets and surface hoar buried near the end of December, will likely remain primed for triggering. Basal facets remain a concern in shallow snowpack areas and an overlying snowpack structure favoring step-down fractures can contribute to the persistence of this deep slab problem.

Régions couvertes