Bulletin d’avalanche

Banff Yoho Kootenay

Dec 18 – 19, 2019Parks Canada
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Archivé · expiré 7 years ago

Danger d’avalanche

Thu
Fri
Alpin
2 · Modéré
Limite forestière
2 · Modéré
Sous la limite
1 · Faible

Points saillants

The extent of the new wind slab distribution is uncertain. Where it exist you can expect the new load to be reactive.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Likely
    Taille
    1–1.5

    Sustained strong winds Tuesday have formed new wind slabs at alpine and tree line elevations. The distribution of the new load is uncertain. Where it is present you can expect the new load to be reactive in the short term.

  • Deep Persistent Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3

    The recent snow sits over weak facet and crust layers. As time goes on the chance of triggering is becoming less likely, but there is lots of uncertainty as to where you could trigger an avalanche and what it will take to get it moving.

Weather Forecast

Strong winds Tuesday will begin to dissipate over night, expect values to remain in the moderate range Wednesday. Temperatures will gradually warm through the week with forecasted freezing levels climbing to 1600m by Friday. A trace of snow for Wednesday, Thursday. Accumulation will intensify by the weeks end with up to 25cm Saturday.

Snowpack Summary

Strong winds have formed new wind slab at alpine and tree line. The distribution of this new load is uncertain. Beneath the recent 40-60 cm of storm snow, the snowpack structure is generally weak, consisting of facets and depth hoar. The Nov crust is present up to 2500m and ~30 cm up from ground. Snowpack depths at treeline range from 80-160 cm.

Avalanche Summary

No new natural avalanche activity for the past two days. Local ski hills have reported small wind slabs reactive to ski cuts.

Confidence

Régions couvertes