Bulletin d’avalanche

Northwest Coastal

Feb 20 – 21, 2013Avalanche Canada
Voir sur la carte
Archivé · expiré 14 years ago

Danger d’avalanche

Fri
Sat
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
Ouvrir la carte complète

Points saillants

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–4
    The recent snow and wind have been building cornices on lee features. These cornices are likely weak and may fail at anytime. Cornice failure has the potential to trigger large avalanches.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    2–5
    New snow may not bond well to the previous snow surface (surface hoar, wind slab, sun crust) and may be easily triggered by the weight of a rider. Be especially wary of exposed north through east facing slopes where wind loading is likely.

Confidence

Good

Weather Forecast

Synopsis: A series of frontal systems is expected to affect the region over the next few days bringing steady precipitation and seasonal temperatures.  Overnight and Thursday: Periods of snow – 20-30 cm. The freezing level is around 600 m. Winds are moderate to strong from the west-southwest. Friday: Heavy snowfall – 30-40 cm. The freezing level remains around 500-600 m and winds are strong from the west.Saturday: Cloudy with light snow. The freezing level is around 500 m and winds ease to moderate from the southwest.

Avalanche Summary

Recent natural avalanche activity is limited to size 1-1.5 loose snow avalanches in steep terrain. Explosive control in Bear Pass produced a few size 2-2.5 slab avalanches on Tuesday.

Snowpack Summary

A layer of surface hoar and a sun crust are now buried by a few cm's of new snow. Below this the recent storm snow has settled and gained strength over the past couple days. Pockets of wind slab have formed on a variety of aspects in exposed terrain near ridge crests, and may be susceptible to triggering in steep terrain. Cornices that now loom over many features may become weak with continued growth and/or daytime warming. The mid and lower snowpack layers are generally well settled.

Régions couvertes