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Avalanche Forecast

Archived

Apr 4th, 2026–Apr 5th, 2026

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Banff Yoho Kootenay, Little Yoho, Banff, East Side 93N, Kootenay, Lake Louise, LLSA, Sunshine, West Side 93N, Field.

Shady aspects continue to offer good skiing. Large cornices are a concern, as they can trigger deeper layers in the snow.

Mainly cloudy conditions should minimize the effect of higher freezing levels on Sunday, but monitor locally.

Confidence

Moderate

  • We are uncertain due to variable freezing levels.

Avalanche Summary

No new avalanches were observed or reported on Saturday.

Snowpack Summary

Lingering wind slabs persist in the alpine. Sun crusts on solar aspects up to ridgeline. Shady aspects hold dry settled snow above 2100 m. The March 20th rain crust is 10 to 50cm deep and extends up to 2100-2300 m. The Jan 24th persistent weak layer of facets and crust is down 70-160+ cm and becoming non-reactive. Below this, the snowpack is solid with no significant weaknesses.

Weather Summary

Sunday - Mainly cloudy with trace amounts of snow, light to moderate ridgetop winds, and freezing levels rising to 2400m

Monday: much the same, with some sunny patches and 2600m freezing levels.

Tuesday - 5cm, mainly cloudy and dropping freezing levels.

Terrain and Travel Advice

  • Cornice failures could trigger large and destructive avalanches.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.