Bulletin d’avalanche

Banff Yoho Kootenay

Mar 2 – 3, 2019Parks Canada
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Archivé · expiré 8 years ago

Danger d’avalanche

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

The invasion of  the Arctic air back over the divide felt like a Lion today,,, or was it a Groundhog? It would seem the February cold snap is not finished with us yet.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely
    Taille
    1–2
    We expect a few lingering windslabs, but for the most part these slabs are old and are likely only to be found in very steep or extreme terrain near wind exposed ridge crests. Pay close attention to the feeling of the surface snow under your feet.

  • Loose Dry

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–2
    A sustained period of cold weather has created weak, dry, faceted surface snow. In steep terrain, these facets are easily triggered and can quickly gain enough mass to affect skiers and climbers, especially in gullies.

Weather Forecast

Arctic air pushed back through from the prairies Friday with cold heavy air flowing up the main valleys squeezing small amounts of snow out of the retreating Pacific air. This Arctic air will dominate through the weekend before it begins to retreat. Light winds and sunny skies should make this tolerable if you can endure the cold start.

Snowpack Summary

Cold temperatures continue to weaken the surface snow. Wind effect is common in the alpine and several recent crusts can be found on steep solar slopes. Despite the weakening slab above it, Jan 17 surface hoar lingers down 40-60 cm in isolated locations and produces hard, resistent shears. A weak basal snowpack exists in thin snowpack areas.

Avalanche Summary

No reports of slab avalanches have come in today however loose snow avalanches or 'point release sluffs' have become common in steep terrain. Given the right terrain these sluffs can amount to significant avalanches: they start slow but gain mass quickly and would be very 'real' for those caught in a terrain trap such as above a cliff or in a gully

Confidence

Régions couvertes