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Avalanche Forecast

Archived

Apr 24th, 2021–Apr 27th, 2021

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

Regions

Waterton Lakes.

20-30cm of new snow sits over a firm crust potentially making storm slabs reactive to human triggers.

Give the new snow time to settle as we transition back to spring conditions early next week.

Weather Forecast

10mm of precipitation is expected Saturday - Sunday evening with freezing levels at approx 2000m. Clearing trend begins Monday.

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

20-30cm of recent snowfall has formed a storm slab which sits over a supportive crust. This crust exists at all elevations except on above 2100m north faces. The snowpack below the storm slab is well consolidated with large cornices lingering in the alpine.

Avalanche Summary

Multiple loose dry avalanches up to Size 1.5 observed on solar aspects on Friday.

Please consider submitting a MIN report if you see avalanche activity.

Confidence

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.