Bulletin d’avalanche

South Columbia

Dec 31, 2013 – Jan 1, 2014Avalanche Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

Thu
Fri
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    3–5
    A variety of buried surfaces exist and could be triggerable in the upper 100 cm of the snowpack.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    New snow is bonding poorly in the upper snowpack. Expect touchy conditions to develop with additional forecast snow and strong winds.

Confidence

Fair - Intensity of incoming weather systems is uncertain on Thursday

Weather Forecast

Wednesday: Dry in the morning with flurries in the afternoon. Treeline temperatures around -5C. Winds NW 30-40 km/h at ridgetop.Thursday: 10-15 cm new snow expected. Freezing levels rising briefly to around 1500 m in the afternoon. Winds W 60-80 km/h at ridgetop.Friday: 2-5 cm new snow expected. Temperatures around -7C. Winds around 30 km/h from the NW.

Avalanche Summary

Two small (size 1) avalanches were reported on Monday, one on a E aspect and one on a NW aspect, triggered from ski-cutting the upper storm snow.

Snowpack Summary

Snowpack depths in this region average around 140-190 cm. 20 cm of recent storm snow has been reported to be poorly bonding to the older snow below. A weak layer consisting of surface hoar crystals, stellar crystals and/or a crust lies around 30-50 cm below the surface. At around 60-90 cm, another weak layer exists. This one was buried early December and comprises surface hoar, facetted snow, and/or a crust. It has shown variable reactivity in recent snowpack tests, but many professional operators are considering it carefully.There are two deeper layers of note. The late-November persistent weak layer consists of a sun crust on steep south facing slopes and surface hoar in sheltered areas and is now buried 70-110cm below the surface. The October deep persistent weak layer consists of a layer of facets sitting on a crust at the base of the snowpack. This layer is predominantly found on northerly aspects at treeline and in the alpine. The depth of both these layers makes directly triggering an avalanche on them unlikely (maybe a heavy load on a thin spot in steep terrain). Their presence could, however, increase the size of a potential avalanche through step-down.

Régions couvertes