Bulletin d’avalanche

Northwest Inland

Mar 18 – 19, 2013Avalanche Canada
Voir sur la carte
Archivé · expiré 14 years ago

Danger d’avalanche

Wed
Thu
Alpin
3 · Marqué
Limite forestière
3 · Marqué
Sous la limite
2 · Modéré
Ouvrir la carte complète

Points saillants

Avalanche hazard in exposed areas will increase rapidly as the wind picks up.

Problèmes avalancheux

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    2–6
    Cornices are well developed. They are likely to be most sensitive when exposed to daytime heating or solar radiation.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–5
    Recent new snow has consolidated into a slab and is reacting to human triggers. The primary weak layer comprises surface hoar and appears to be touchy.

Confidence

Poor - Due to limited field observations

Weather Forecast

Synopsis: A Frontal system passes mostly to the south of this region on Tuesday night/Wednesday, bringing generally light precipitation.Tuesday: Flurries, with light snowfall starting late in the day. Freezing level 500 m. Southwesterly ridgetop winds increasing to around 50 km/h.Wednesday: Around 5 cm new snow. Freezing level 500 m. Winds light southeasterly.Thursday: Mostly dry with some good sunny breaks. Gusty northwesterly winds.

Avalanche Summary

On Saturday, a size 2 avalanche was triggered remotely on a south aspect at 1800 m. This avalanche ran on the new snow/crust interface. On Friday, a size 2 remote-triggered avalanche was reported from a west aspect at 1450 m, likely failing on the March 9th surface hoar layer down around 50 cm. Another human-triggered avalanche was reported on Friday from a north aspect slope.

Snowpack Summary

20-40 cm of recent storm snow rests on a variety of old snow surfaces, including crusts, previous wind slabs and surface hoar (buried March 9th). Warmer temperatures and recent winds have now set this new snow into a reactive slab. The March 9th surface hoar layer is reported to be very touchy and appears to exist at all elevations and on a variety of aspects. I suspect cornices have become well-developed and could easily become unstable with daytime heating. The mid snowpack is generally well settled and strong.

Régions couvertes