Bulletin d’avalanche

Banff Yoho Kootenay

Nov 28 – 29, 2013Parks Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

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

Skiing prospects are not too enticing until we get more snow.  Many ice climbs are in and have pounded trails to the base of many popular climbs.

Problèmes avalancheux

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    2–3
    The Oct 27 crust or basal facets continue to produce easy failures in field tests and in explosive work around the ski areas. The greatest potential for triggering this layer is on steeper windloaded pockets.

Weather Forecast

Winds will pick up to moderate SW on Thursday.  Light snow forecasted for Friday.  If the forecast is correct, the next substantial snowfall (10-15 cm) is expected on Sunday.

Snowpack Summary

On alpine lee features, the snowpack consists of windslabs over a weak midpack with a very weak base of facets. The Oct 27 crust on N-NE aspects is breaking down, but is still a sliding layer near ground. On average at treeline there is 70 cm of snow, barely blanketing the rocks and stumps.

Avalanche Summary

No new naturals in past few days. Explosive work at Sunshine and Lake Louise still producing size 1.5-2 avalanches on North and West aspects failing on basal facets or the Oct 27 crust. Propagations are not as significant as earlier in the week, but any steep windloaded feature in the Lake Louise area were producing avalanches.

Confidence

Due to the quality of field observations

Régions couvertes