Bulletin d’avalanche

Banff Yoho Kootenay

Nov 16 – 17, 2015Parks Canada
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Archivé · expiré 11 years ago

Danger d’avalanche

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

A natural cycle is tapering off as of Sunday. Remain vigilant on Monday as human triggering will remain likely on Monday. Ice Climbers: Be wary of steep gully features. AB

Problèmes avalancheux

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    As a result of Sunday's loose dry avalanche cycle in steep gullies ice climbers in particular should expect sluffing in the features on Monday

  • Storm Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–3
    70cm of recent snow is settling into a 50-60cm slab sitting over a mix of surface hoar, facets and sun crust near the ground. Combined with wind loading in open areas, this is creating ideal conditions for human triggered slabs in steep terrain.

Weather Forecast

Another small storm will give the region about 20cm of snow on Tuesday. Likely, this will keep danger ratings elevated. Wednesday an arctic high pressure will start to develop bringing very cold temperatures to the region. We expect the cold temps to slow down any natural avalanche cycle that may develop as a result of Tuesday's storm.

Snowpack Summary

85cm of snow on the ground at tree line near Bow Summit today. 10-15cm of that fell overnight. The snowpack in this area lacks cohesion, and forecasters were routinely breaking through to the ground. Snowpack tests produced moderate results, the failure being right on the ground. Nov 5 and 11 layers found 15cm and 30cm from ground respectively.

Avalanche Summary

Observations near Bow Summit today indicate a widespread loose/dry avalanche cycle. They ran from steep gullies and poured out onto the fans below (up to size 2). Additionally two substantial avalanches to ground were reported near the Lake Louise ski area. The Lipalian slide path produced a size 2.5 and West Bowl avalanched size 2.

Confidence

Régions couvertes