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Avalanche Forecast

Archived

Apr 14th, 2021–Apr 17th, 2021

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

Regions

Waterton Lakes.

The potential is there to have a widespread loose wet avalanche cycle in the afternoons at the height of the day time warming and solar input.

Weather Forecast

Thurs:Sun and cloud. Alp low -4. Freeze level 2000m. Mod NE winds

Fri:Sun and cloud. Alp high 0. Freeze level 2100m. Mod NE winds

Sat:Mostly sun. Alp high 6. Freeze level 2800m

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

Up to 30cm of recent snow at treeline and above with minimal wind effect. This sits on a supportive crust that exists to ridgetop except on high north faces. Overall a well consolidated snowpack with the lower half composed of dense facets and decomposing crusts, which haven't produced test results or recent avalanches.

Avalanche Summary

No new slab avalanches reported or observed. Some pin wheeling was observed terrain below 1500m. 

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

Confidence

Freezing levels are uncertain on Friday

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.

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.