Bulletin d’avalanche

Northwest Coastal

Jan 1 – 2, 2015Avalanche Canada
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Archivé · expiré 12 years ago

Danger d’avalanche

Sat
Sun
Alpin
4 · Fort
Limite forestière
3 · Marqué
Sous la limite
3 · Marqué
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Points saillants

New snow, wind, and fluctuating temperatures are on the menu for the next couple days. Choose conservative terrain until the new snow has a chance to settle and bond.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–6
    A series of crusts in the upper and middle snowpack may be reactivated by the storm. Surface avalanches in motion have the potential to step down creating large destructive avalanches.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–4
    New snow may not bond well to the previous snow surface and could be triggered naturally or by the weight of a rider, especially where fresh dense wind slabs form (exposed north to east aspects).

Confidence

Fair - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

Synopsis: A center of low pressure crosses the region on Friday resulting in moderate precipitation – 15-25 cm. The freezing level should be around 500 m and winds are moderate to strong from the west. The weekend looks mainly cloudy, cooler, and a bit drier. Expect 5-10 cm each day – maybe a bit more later on Sunday. The freezing level is at valley bottom. Ridge winds are light to moderate from the southwest-southeast, but we could see strong outflows develop in the coastal inlets and valleys on Sunday.

Avalanche Summary

There have been no reports of avalanches for the past few days. Watch for fresh, touchy wind and storm slabs to develop over the next couple days.

Snowpack Summary

Strong outflow winds earlier this week left a variety of wind affected conditions in exposed terrain at all elevations. You will likely find wind pressed snow on north aspects, thicker wind slabs on south facing features and some degree of cross-loading on everything else. At and below treeline widespread surface hoar was reported, which may become an issue once its buried by new snow. Some areas experienced light rain or freezing rain early on New Years Day which could lessen or eliminate this problem. The mid December crust can be found down around 30 to 80 cm and is sandwiched with facets and surface hoar. The mid November crust down 70 to 175 is gaining strength but is still reactive in test profiles. It is likely trending towards dormancy.

Régions couvertes