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Avalanche Forecast

Archived

Mar 27th, 2021–Mar 30th, 2021

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

10-20cm of new snow is expected Sunday / Monday with strong to extreme winds. Pay attention to the rapidly changing conditions if you choose to brave the weather.

Weather Forecast

Sun: Periods of wet snow mixed with rain in the townsite. 10-15 cm snowfall at Cameron Lake.  Alpine high of +4 with freezing level at 1800m. Moderate SW wind with extreme gusts up to 120km/h

Mon: Mainly cloudy with scattered flurries. 2-5cm of snow with freezing level at valley bottom. Moderate SW wind with strong gusts

Tues: A mix of sun and cloud

Snowpack Summary

10-20cm of new snow is expected on Sunday with strong- extreme SW wind. This will create fresh wind slabs 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 with the lower half composed of dense facets & decomposing crusts

Avalanche Summary

No recent avalanche activity reported.

Confidence

Intensity of incoming weather systems is 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.