Bulletin d’avalanche

Banff Yoho Kootenay

Jan 19 – 20, 2018Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Sat
Sun
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

New windslab formation has created a reactive avalanche problem at higher elevations.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible - Likely
    Taille
    1–2
    New snow and accompanying winds have created windslabs at alpine and treeline elevations. Due to variable winds in the alpine expect the spacial distribution of this problem to be widespread.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2.5
    This layer continues to be the cause of much uncertainty with forecasters - we think its bad, but yet it has not yet produced many large avalanches. We remain uneasy about it despite indications of generally good conditions.

Weather Forecast

Snow tapering Thursday with only trace amounts expected by Friday. Temperatures are expected to cool into the weekend with daytime highs of -5. Winds will drop  Monday night and hold steady in the light to moderate range for the weekend.

Snowpack Summary

Moderate to strong winds over the past 24 hours has developed windslabs on immediate lees at alpine and treeline elevations. The Dec 15 facet/ surface hoar/ sun crust layer is still a concern in the forecast region, in many areas this layer now sits 40-60 cm down. Much of the snowpack is well facetted with little structure below treeline.

Avalanche Summary

One size 2 natural avalanche observed releasing from a wind loaded lee features. Many small size 1 avalanches triggered from ski cut releasing pockets of winds lab at treeline and above. All avalanches observations today were releasing from windslab.

Confidence

Régions couvertes