Bulletin d’avalanche

South Columbia

Feb 20, 2017Avalanche Canada
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Archivé · expiré 10 years ago

Danger d’avalanche

Mon
Tue
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

The best riding right now is probably on high north aspects, which is also where the hazard is the highest. Don't let your guard down when searching for fresh powder.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–3
    Wind slabs are likely still lurking below ridge crests and behind terrain features at higher elevations. Choose your line carefully and use ridges or ribs to avoid pockets of wind slab.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    A persistent weakness down 50-80 cm remains remains sensitive to light triggers in isolated areas. Smaller avalanches have the potential to step down to this layer.

Confidence

Moderate - The weather pattern is stable

Weather Forecast

We're into a fairly stable weather pattern: seasonal temperatures and isolated flurries.MONDAY: Cloudy with light flurries, local accumulations to 5cm, light to moderate southwesterly winds and freezing levels around 1400 m.TUESDAY: A mix of sun and cloud with light snow flurries starting in the afternoon (5-15cm), light winds and freezing levels around 1300 m.WEDNESDAY: Cloudy with light flurries (5-10cm), light southerly winds and freezing levels around 1100 m.

Avalanche Summary

A couple of skier-triggered wind slab avalanches (to Size 1.5) were reported on steeper (38 degree) north or northwest aspect slopes near 2100m on Saturday. There was also a natural wind slab (Size 2.0) reported on a steep easterly feature near ridge crest at 2200m in the Monashees. Wind slabs at higher elevations are sensitive to light triggers and have the potential to step down and trigger persistent slab avalanches.

Snowpack Summary

We've had minor snowfall amounts (5-20cm) over the weekend with moderate southeasterly winds in some locations. Expect to find 25-40 cm of more recent snow bonding slowly to buried surface hoar and/or a crust, and blown into touchy wind slabs at higher elevations. Below 1500m a frozen rain crust is mostly supportive, but up to 1800m it can be breakable. Storm snow from last week is still bonding poorly to the previous snow surface from early February, which is now down 60-80 cm and includes a sun crust on steep sun-exposed slopes, faceted snow, as well as surface hoar on sheltered open slopes. The mid and lower snowpack are generally well settled and stable in deeper snowpack areas but may be faceted and weaker in shallower areas.

Régions couvertes