Bulletin d’avalanche

Kootenay Boundary

Mar 16 – 17, 2013Avalanche Canada
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Archivé · expiré 14 years ago

Danger d’avalanche

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

Problèmes avalancheux

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–5
    Forecast snow and wind will add to existing storm slab problems at high elevations and may bond poorly to a crust at lower elevations. Give the snowpack time to find its equilibrium before considering aggressive terrain.

Confidence

Fair - Forecast snowfall amounts are uncertain on Sunday

Weather Forecast

Saturday night: Light snow. Light W winds. Freezing level at the surface.Sunday: Light snow. Light NW winds with gusty N winds. Alpine temperature near -7.Monday: Light snow. Light W winds, gusting to strong NW winds. Alpine temperature near -5.Tuesday: Light snow. Light S winds. Alpine temperature near -8.

Avalanche Summary

A widespread avalanche cycle was observed during the storm, which was particularly active as temperatures warmed up. Most avalanches were in the size 1-2 range and failed within, or at the base of, the storm snow. They were observed on all aspects and at most elevations.

Snowpack Summary

A series of warming events (sun and rain) and subsequent cooling has left a variety of crusts in the upper snowpack. Recent rain soaked the snowpack at low elevations, and moistened surface layers at upper elevations. A layer of surface hoar and/or a crust is buried about 40 cm deep. Wind slabs and cornices exist near ridge tops. Deeper in the snowpack, a weak interface buried in mid-February is still on the radar. Although unlikely to be triggered, it remains possible with a very heavy load or from a thin-spot trigger point, particularly in locations where the snowpack above this layer is free of supportive crusts.Until temperatures remain cool for an extended period of time, I’d maintain some degree of suspicion about the overall strength of the snowpack.

Régions couvertes