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Avalanche Forecast

Archived

Mar 29th, 2021–Apr 1st, 2021

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

Regions

Waterton Lakes.

Recent snowfall is bonding well in sheltered locations but pockets of wind slab will become more reactive as the SW wind returns on Tuesday.

Weather Forecast

Tuesday: A mix of sun and cloud with isolated flurries. Light West wind with gusts up to 50 m/h. Alpine high of -3.

Wednesday: A mix of sun and cloud. Moderate SW wind. Freezing level rising to 1900m during the day.

Thursday: Sunny with cloudy periods. Moderate SW wind with gusts up to 100km/h

Snowpack Summary

10-20cm of new snow is bonding well to previous surfaces but expect the recent snow to become more reactive as it transitions to wind slab on tuesday. These wind slabs sit over a variety of old surfaces including a thick crust that exists to ridgetop (except on high N aspects) or old wind slab on N-E alpine slopes. Mid snowpack is well consolidated

Avalanche Summary

No recent avalanche activity observed. Please consider submitting a MIN report if you see an avalanches.

Confidence

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 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.