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Avalanche Forecast

Archived

Mar 15th, 2022–Mar 16th, 2022

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

Regions

Jasper.

35cm new snow over the past 4 days in the Icefields area - less further north. Increasing and sustained westerly winds in the forecast - wind slab problem expected to increase in size and consequence in the short term.

Weather Forecast

Wednesday: Sunny periods; isolated flurries. Trace precipitation. Alpine High -7 C. Wind west 20 gust to 45 km/h. Freezing level (FL) 1400m

Thursday: Mainly cloudy; isolated flurries. Trace precipitation. Alpine Low -10 C; High -6 C. Wind SW 20 gust 55km/h. FL 1500m

Friday: Sunny periods; isolated flurries. Trace. Alpine Low -10 C; High -7 C.

Snowpack Summary

Up to 35 cm of new snow since Friday in the Icefields area siting atop a well settled midpack. Less snow further north. A temperature crust down 20-50cm is decomposing and generally below 2300m on steep solar aspects. A facet and depth hoar layer is at the bottom of the snowpack.

Avalanche Summary

Avalanche control highway 93 south produced up to size 1.5 wind slab averaging 30cm deep. A few size 1.5 dry loose observed in steep alpine terrain. Ski cut on an unsupported feature Maligne range produced a size 1.5 wind slab.

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.