Bulletin d’avalanche

Banff Yoho Kootenay

Nov 23 – 24, 2019Parks Canada
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Archivé · expiré 7 years ago

Danger d’avalanche

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

Points saillants

Watch locally for wind slabs which can step down to deeper weak layers. Depending on which forecast you look at, 20-25cm is possible by early next week along the divide. 

Problèmes avalancheux

  • Wind Slabs

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

    Strong winds have redistributed much of the loose snow hanging around. With snow in the forecast through the weekend these will grow in size.

  • Deep Persistent Slabs

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

    The lower snowpack consists of weak facets. There is potential for avalanches to step down to this deeper layer.

Weather Forecast

3-5 cm of snow along the divide tomorrow afternoon but likely no snow on the East slopes. The wind will be moderate to strong from the West and temperatures will be -7C in the alpine and close to 0C in the valley bottom. Snow will continue Sunday and Monday with 20-25cm possible along and W of the divide.

Snowpack Summary

15-30 cm of faceted snow overtop of a melt freeze crust from early November (crust only exists below 2300 m). Below this crust unconsolidated facets exist to ground. Treeline snow depths range from 50-80 cm, with up to 110 cm in wind loaded alpine areas. Some areas of wind slab exist at ridgetops and cross loaded features.

Avalanche Summary

Some loose dry avalanches in the range of size 1.5-2 in steep, cross loaded gullies on Observation Peak, and a couple of smaller wind slabs from steep ridgetops in the same area.

Confidence

Régions couvertes