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Avalanche Forecast

Archived

Feb 10th, 2022–Feb 11th, 2022

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

Regions

Jasper.

Daytime warming with a mixed bag of strong solar influence, rain, or loading will press the hazard to Considerable over the day. Extra caution advised in all avalanche terrain as the snowpack flexes through these first diurnal warming swings.

Weather Forecast

Cooler air filtering in behind the present weather system and will drop freezing levels to valley bottom overnight. Winds will remain strong to extreme, west-northwest at ridgetop and will gradually weaken to just strong by morning. Flurries and light snow for the bulletin region overnight. Mild, sunny and dry for Friday.

Snowpack Summary

Exposed alpine stripped to rock at ridgetop and open features. Upper snowpack subject to diurnal swings in temperature and solar effect, TL and below. Dec FC down ~20-70cm. Basal FC/DH widespread throughout forecast zone.

Avalanche Summary

Significant loose wet/wet slab avalanche cycle observed on low elevation targets through the Parkway and Maligne highway corridors. Extended emergency closures possible at any time as the snowpack adjusts to the changing conditions. Avalanche control along the Parkway produced several large avalanches impeding through traffic longer than expected.

Confidence

Intensity of incoming weather systems is uncertain

Problems

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.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.