Bulletin d’avalanche

Banff Yoho Kootenay

Jan 20 – 21, 2018Parks Canada
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Archivé · expiré 9 years ago

Danger d’avalanche

Sun
Mon
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible
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Points saillants

Moderate danger means heightened avalanche conditions where human triggered avalanches are possible. Be cautious when traveling in complex terrain.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Recent 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
    The Dec 15 layer continues to cause some uncertainty with forecasters. Few avalanche observations have been reported on this instability, though widespread cracking and whumphing is still occurring when traveling in the backcountry.

Weather Forecast

Trace amounts of precipitation expected through the weekend, winds will remain in the light to moderate rang and temperatures steady between -8 to -12.

Snowpack Summary

Newly formed windslabs on immediate lees at alpine and treeline elevations. In sheltered areas the upper snowpack consist of 20-30cm of soft slab over the Jan 6 surface hoar, this layer has been reactive in test results. The Dec 15 layer is still a concern 40-60 cm down. Much of the snowpack is facetted with little structure below treeline.

Avalanche Summary

Minimal avalanche activity reported today, Lake Louise ski patrol reported small skier triggered windslabs from loaded pockets at ridge crest.

Confidence

Régions couvertes