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Avalanche Forecast

Archived

Mar 25th, 2021–Mar 28th, 2021

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

Regions

Waterton Lakes.

Recent snowfall is bonding well but pockets of wind slab still exist on lee features in the alpine. Take a step back and be mindful of your overhead hazard if the temperatures rise as forecast on Sunday. 

Weather Forecast

Friday: Cloudy with sunny periods & flurries. Alpine high of +1. Moderate W wind with strong gusts.

Saturday: Cloudy with sunny periods & isolated flurries. Alpine high of -2. Moderate SW wind.

Sunday: Cloudy with sunny periods & isolated showers. Alpine high of +7 with freezing level rising to 2300m. Moderate SW wind with extreme gusts upto 100km/h

Snowpack Summary

Not much change to the snowpack in the past week. 5-20cm of settled storm snow sits over a thick crust that exists to ridgetop except on high north faces. This tops a well consolidated snowpack with the lower half composed of dense facets and decomposing crusts, none of which have been reactive in snowpack tests or recent avalanches.

Avalanche Summary

Size 1 Loose dry avalanches in a steep lee features on the Akamina Parkway.

Confidence

Freezing levels are uncertain on Sunday

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.

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.