Bulletin d’avalanche

Banff Yoho Kootenay

Mar 18 – 19, 2022
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Archivé · expiré 5 years ago

Danger d’avalanche

Sun
Mon
Alpin
3 · Marqué
Limite forestière
2 · Modéré
Sous la limite
2 · Modéré
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Points saillants

A little windier Friday night and a little warmer on Saturday is keeping the hazard rating steady. We are keeping danger rating at moderate below treeline due to recent avalanche activity noted in Kootenay Park on Thursday.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2

    Winds have been variable throughout the region, but expect fresh wind slabs in the alpine and some exposed tree-line locations.

  • Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    1.5–3

    Buried crust/facet layers exist in the upper snowpack on solar aspects and all aspects below 1700m. Recent tests show moderate sudden planar results. Exercise caution in areas where these crusts exist, there is uncertainty about how they will react.

Weather Forecast

Continued flurries for Saturday with a few cm's of accumulation and a mix of sun and cloud through the day. Winds will be in the moderate range out of the SW at ridge crests. Temperatures increase slightly with treeline temperatures ranging from -5 to -3 C and freezing levels reaching 1800 m before falling back down on Sunday.

Snowpack Summary

20-50 cm of recent snow forming fresh wind slabs in alpine and some treeline terrain with mod-strong SW winds. On solar aspects a variety of buried sun-crusts down 30-60 cm are producing moderate results in tests. In addition there is a buried temperature crust at lower elevations that exists on all aspects, and has been reactive in Kootenay Park.

Avalanche Summary

Explosive control on Whymper and Simpson areas of Kootenay Park on Thursday produced small wind-slabs up to size 2.5. Of note in Simpson area is when debris hit lower elevations (1800-1600 m) it triggered new slabs down 50 cm on a suspected temperature crust. Propagations on this layer were significant and extended up to 100 m.

Confidence

Régions couvertes