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Avalanche Forecast

Archived

Apr 15th, 2026–Apr 18th, 2026

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

Regions

Waterton Lakes, Waterton.

By Thursday afternoon we are expected to receive up to 50 cm of snow. Storm slabs are our primary concern for Thursday.

Friday and Saturday the sun will begin to appear, expect to see wet loose avalanches on solar slopes and at lower elevation bands.

Confidence

Avalanche Summary

A few wet loose avalanches, up to size 1 were observed on Monday. Since the start of the storm we have had poor visibility, but suspect there has been small sized natural avalanches.

Snowpack Summary

Thursday morning's snow will be falling on top of 25 cm of storm snow from Wednesday. Under this sits a melt freeze crust. On some isolated north‑facing alpine slopes, facets persist above a thick rain crust from March's atmospheric river. The mid‑ and lower snowpack are well settled with no notable weak layers.

Weather Summary

Thurs

26 cm of snow by Thursday morning. Alpine Low of -10 °C, High of -7 °C. Wind gusting to 30 km/h. Freezing level at valley bottom.

Fri

A mix of sun and cloud with isolated flurries. Alpine Low of -8 °C, High of -3 °C. E wind gusting to 30 km/h. Freezing level at 1800 m.

Sat

Sun and clouds. Alpine Low of -5 °C, High of 0 °C. E wind gusting to 30 km/h. Freezing level at 2100 m.

Current weather forecast: Mountain Weather Forecast

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Rocks will heat up with daytime warming and may become trigger points for loose wet avalanches.
  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.