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Avalanche Forecast

Archived

Dec 27th, 2016–Dec 28th, 2016

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

Regions

Kananaskis.

Widespread wind slabs now in the Alpine and Tree line.  Choose your route carefully to not expose yourself onto avalanche terrain.  Human triggered avalanches are a concern.

Confidence

High -

Weather Forecast

Strong winds today in the Spray area from valley bottom to ridge top. Forecasted strong winds until the end of the week with tomorrow temperature as -15c as a high. Intense snow redistribution due to winds.

Avalanche Summary

Expect the recent wind slabs to be sensitive to human triggering. Areas to the West of Kananaskis Country have started to see more avalanche activity with both wind slabs on the Dec 18 facets. More winds will only increase the likelihood of triggering.

Snowpack Summary

Most of the new snow we got over Christmas has now been moved around by the wind at all elevations. Below tree line, travel continues to be challenging due to the lack of snow. The big difference is happening at tree line where now wind slabs have been deposited on mostly  S to NE aspects overtop of the recent snow at Christmas. Widespread wind slabs can be expected in the Alpine from the previous and continued strong winds. All of these recent wind slabs sit overtop of a previous wind slab that formed before Christmas. Thicker surface wind slabs up to 50cm can be especially found in lee pockets and cross loaded areas or gullies.

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.

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.