Bulletin d’avalanche

South Columbia

Jan 24 – 25, 2016Avalanche Canada
Voir sur la carte
Archivé · expiré 11 years ago

Danger d’avalanche

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

Points saillants

Wind and storm slabs are a big concern right now. Use caution around tree line and above.A Special Public Avalanche Warning is in effect for this forecast region.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–5
    A small wind or storm slab avalanche might provide enough mass to trigger this deeper instability.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    Wind and storm slabs are the chief concern these days,  above and below tree line, and on all lee aspects in the alpine.

Confidence

Moderate - Freezing levels are uncertain

Weather Forecast

The  southern interior will be under the influence of a weak high pressure system for the forecast period.  Partly cloudy skies with some sunny periods and freezing levels at valley bottom overnight, then rising to around 1000 metres during the day.    In advance of he next Pacific frontal system, freezing levels on Tuesday may rise to 2000 metres.

Avalanche Summary

Numerous slab avalanches up to size 2.5 have been reported in the past 2 days. Many were naturals as a result of recent storm loading. A large number were skier controlled. Many of these failed around treeline and below, on buried surface hoar, between 20-40 cm deep. Many of these were triggered remotely, highlighting the volatility of the persistent slab. An increasing number of wind slabs have also been failing at alpine/ treeline elevations, and also running on surface hoar. It is likely that a natural avalanche cycle occurred on Friday and perhaps Saturday after the warm, windy storm.

Snowpack Summary

Recent snowfalls and south west winds have created new storm slabs throughout the region and wind slabs on lee features. This has added additional load and stress to an already touchy persistent slab. This 40-90 cm thick persistent slab overlies a variety of surfaces including large surface hoar, sun crusts, rime crusts and facets. The slab is ripe for human and natural triggers and is especially touchy at and below treeline. The mid and lower snowpack are generally well settled and strong.

Régions couvertes