Bulletin d’avalanche

Northwest Coastal

Jan 19 – 20, 2014Avalanche Canada
Voir sur la carte
Archivé · expiré 13 years ago

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
Ouvrir la carte complète

Points saillants

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–4
    Thin wind slabs that formed Saturday night and Sunday should be largely manageable. Be aware off the potential for deep hard wind slabs if you're sizing up bigger terrain in the alpine.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    4–7
    Two weaknesses have the potential to surprise folks: Surface Hoar one meter below the surface and very weak basal facets near the ground. Vigilant slope by slope evaluation and/or a modest terrain approach are appropriate at this time.

Weather Forecast

A strong ridge of high pressure continues to dominate with no sign of a breakdown in sight. The NW Coast should fair slightly better than the rest of the province with a few pulses of precip. Freezing levels are on the rise throughout the forecast period.Monday: Freezing Level: 1200m. Precip: 3/8mm; Wind: Lht S, Strong SW at ridgetop.Tuesday: Freezing Level: Inversion, Above Freezing Air from 1300 2100m; Precip: Nil; Wind: Mod, SW.Wednesday: Freezing Level: Inversion breaking down late in the day, Above Freezing Air from 1300 2000m; Precip: 1/3mm Wind: Mod, SW

Avalanche Summary

No new avalanche activity reported on Saturday. The last significant cycle tapered off Jan 15th. It featured natural avalanches to size 4 with releases on all aspects and elevations.

Confidence

Fair - Freezing levels are uncertain

Snowpack Summary

Previously strong winds have left widespread wind loading/wind damaged snow in their wake. Most of these wind slabs are probably growing old and tired but may still pose a problem in bigger terrain. Warming temps along with a bit of rain at lower elevations has formed a variety of crusts at and below treeline. The early January surface hoar is most active in the north of the region between 900m and 1400m. It was a player during the last cycle even in low angled terrain. Look for it 70 -100 cm below the surface. Professionals continue to keep an eye on the basal facets which can be found down around two meters below the snow surface.

Régions couvertes