Bulletin d’avalanche

Banff Yoho Kootenay

Mar 31 – Apr 1, 2026Avalanche Canada
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Archivé · expiré 6 months ago

Danger d’avalanche

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

Cornices remain fragile, limit exposure. Strong solar input can rapidly affect the snowpack despite cool air temperatures, so plan to start early and finish early.

Problèmes avalancheux

  • Wind Slabs

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

    Storm snow and wind from last week formed wind slabs that continue to linger in alpine terrain.

  • Persistent Slabs

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

    A facet/crust interface from Jan is buried 70–180 cm deep. We are still seeing some hard, sudden test results at elevations above the Mar 20th rain crust (~2300 m). Large triggers like cornice falls or surface avalanches may trigger this layer, similar to the Wapta Peak avalanche observed today.

Confidence

Moderate

  • We are uncertain about forecast precipitation amounts.

Avalanche Summary

Forecasters on Mt. Field today noted that cornices are particularly fragile. They observed a size 3 cornice-triggered avalanche, approximately 48 hours old, that released from Wapta Mountain and ran to the moraine on Mt. Field. Lake Louise patrol also reported that small cornice failures were triggering small wind slabs in alpine lee terrain.

Snowpack Summary

20-45 cm of snow fell over the last week, with moderate to strong SW winds creating wind effect in open areas. Wind slabs linger. This snow fell on the Mar 20th rain crust, which exists below 2100-2300m. Above this crust on solar aspects, various buried sun crusts exist, some extending to higher elevations. Cornice growth continues.

The Jan 24th facet layer is buried 70–180 cm deep at treeline and in the alpine, with some tests still producing hard, sudden results

Weather Summary

Slightly warmer temperatures on Wednesday, with valley highs around 2 and ridgetop temperatures near −6. Up to 8 cm of snow is expected late in the day, though model guidance remains uncertain. Winds may increase into the low end of strong from the south by midday.

Terrain and Travel Advice

  • Cornice failures could trigger large and destructive avalanches.

Régions couvertes