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Avalanche Forecast

Archived

Apr 21st, 2021–Apr 24th, 2021

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, human triggered possible.
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.

Regions

Waterton Lakes.

Temperatures are forecast to drop with 5-10cm of new snow over the next 3 days. Loose dry avalanches are the primary concern as new snow will sit over a thick crust.

Weather Forecast

Thurs: Cloudy with scattered flurries. 5 cm of snow. Light NE wind. Freezing level 1500m

Fri: Cloudy with sunny periods. Light- moderate NE wind

Sat: Flurries. 7 cm of snow.

Avalanche Canada's Mountain Weather Forecast is a great regional-scale resource for up-to-date weather information. SPOTWX is a good resource for local scale weather forecasts.

Snowpack Summary

5-10cm of new snow is expected Thurs - Sat. This fresh snow will fall over a supportive crust that exists to ridgetop except on high north faces. Overall, the snowpack is well consolidated but cornices and glide cracks have grown recently and should be given a wide birth.

Avalanche Summary

Please consider submitting a MIN report if you see any avalanches.

Confidence

Problems

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.