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Avalanche Forecast

Archived

Dec 27th, 2019–Dec 28th, 2019

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.

Constant SW moderate winds have created windslabs that are ripe for human triggering.

Weather Forecast

The weekend will bring cloudy and sunny periods and a slight warming trend. Day time highs of -5 on sunday. No precipitation expected over the weekend, The winds will continue into Saturday in the moderate westerly range tapering off for Sunday.

CAA's Mountain Weather Forecast for more specific details

Snowpack Summary

6-20mm Surface Hoar growing up to 2200m. Consistent Moderate SW winds for the past 36 hours have created wind slabs in lee features. This overlies a mosaic of buried wind slabs and facetted weak layers. Basal layers continue to develop into larger facets and depth hoar.

Avalanche Summary

Several wind slabs to Size 2 noted in immediate Lee features Treeline and above.

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.