Bulletin d’avalanche

Banff Yoho Kootenay

Apr 20 – 21, 2025Avalanche Canada
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Archivé · expiré last year

Danger d’avalanche

Tue
Wed
Alpin
2 · Modéré
Limite forestière
Sans niveau
Sous la limite
Sans niveau

Points saillants

10–20 cm of new snow is expected with minimal wind, which will improve ski quality. However, watch locally for how this is bonding to harder surfaces below.

The deep layers have been inactive, but weak facets and depth hoar still exist.

Problèmes avalancheux

  • Persistent Slabs

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

    An 80 cm thick midpack slab sits over a weaker, facetted base. On most slopes, recent sun crusts and a buried March 27 rain crust cap this slab, adding strength. We suspect it would take a large trigger, like a cornice or a human in a very steep, thin area, to get this going.

  • Loose Dry

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

    Forecasts vary about how much snow will fall over the next 24 hours, ranging from 10 to 20cm. Watch locally for amounts and how it is bonding to harder surfaces below. With minimal wind expect a dry loose problem, but may act as a small slab if winds pick up.

Confidence

Moderate

Avalanche Summary

No new avalanches were observed or reported over the last 72 hours.

Snowpack Summary

A few cm of snow accumulated above ~2000m on Sunday. Below this, surface crusts exist on solar aspects to ridgetop and on all aspects at treeline and below. On northerly aspects, 10-30 cm dry snow with isolated wind effect in lee areas of the alpine. The March 27 crust is 30-70 cm deep and extends to about 2500m. Below the settled midpack, there are still facets and depth hoar to the ground.

Weather Summary

Monday: 10-20cm of snow is possible in the East, but the amount is highly uncertain. Winds should remain light from the NW, and treeline temperatures will stay below freezing. See image below for details.

Terrain and Travel Advice

  • Even brief periods of direct sun could produce natural avalanches.

Régions couvertes