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Avalanche Forecast

Archived

Nov 27th, 2019–Nov 30th, 2019

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

Regions

Waterton Lakes.

Waterton was hit hard by the recent upslope storm, and a widespread avalanche cycle is expected. The Akamina Parkway remains closed to public access due to construction.

Weather Forecast

Thursday:  Moderate to Strong NE winds, and snow tapering off with the possibility of an additional 5-10cm and cold temperatures.

Friday: Clearing with continued cold temps, Light to Moderate NE winds

Saturday: Temperatures rising with a high of -5 in town, light westerly winds and no new snow.

Snowpack Summary

A strong upslope storm has so far deposited 50-70 cm of snow in the front ranges, which is forming new windslabs with moderate to strong northeast winds. This overlies a variety of bed surface including old wind slabs from strong southwest winds, bare ground and a thick melt freeze crust where snow from the late September snowfall did not melt out.

Avalanche Summary

Forecasters were not able to get out in the field today, but a widespread avalanche cycle is expected at all elevations.

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.