Bulletin d’avalanche

Banff Yoho Kootenay

Dec 13 – 14, 2013Parks Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

5-15 cm has fallen in the last few days and has created touchy wind slabs on NE features. LP

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1–2
    This layer is a concern in isolated areas loaded by wind.  These slabs sit on a weak facetted base. There has been no recent natural avalanches on this layer, but it still may be triggered by skiers or climbers.

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Thin (10-15 cm thick) touchy,low density, storm slabs have been reported in the region on lee features.

Weather Forecast

Continued light flurries, warm alpine temperatures (-6C), and light to moderate west winds with strong gusts expected for the next 2 days.  We may see more intensive flurries on Sunday adding to the existing storm and wind slabs and in turn increase the avalanche hazard.

Snowpack Summary

There is 50-70 cm of snow at tree line which is generally weak, and facetted, but there is some mid-pack support. Some fresh wind and storm slabs exist in lee alpine terrain which may be reactive to skier triggering. The October crust is 10-20 cm from ground and producing mod-hard results with comp. test.

Avalanche Summary

No new natural avalanche activity observed in the last several days. Sunshine forecasters reported ski cutting a size 1.5 avalanche in previously worked terrain. It was a 10-15 cm thick storm slab over a wind slab, which stepped down to the basal rain crust or facets. It was on a lee NE facing alpine feature.

Confidence

Track of incoming weather systems is uncertain

Régions couvertes