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Avalanche Forecast

Archived

Feb 15th, 2021–Feb 16th, 2021

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

Regions

Jasper.

There has been a decrease in natural avalanche activity in the past 2 days, yet there is a concern that human triggered avalanches are still possible in shallow areas where the snowpack is facetted and weak.

Weather Forecast

We will return to seasonal normals with alpine temperatures between -17C and -10C for the next few days. A mix of sun and cloud with trace amounts of snow forecasted for Tuesday. Winds expected to be light from the southwest to northwest.

Snowpack Summary

The upper snowpack has facetted from the recent cold temperatures and overlies a supportive mid-pack, except in shallow areas where the entire snowpack is weak and facetted. Variable wind effect in the alpine and at tree line.

Avalanche Summary

One sz 3 avalanche (wind slab) observed from extreme, alpine, north aspect terrain.  No other avalanches observed.

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.