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Avalanche Forecast

Archived

Feb 25th, 2013–Feb 26th, 2013

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

Kananaskis.

Strong winds will conspire to keep danger ratings in alpine terrain at Considerable for another day or two.  Rising temperatures as the week moves along mean it may become necessary to keep a watchful eye on solar aspects for concerns.

Confidence

Fair - Due to variable snowpack conditions

Weather Forecast

Only a couple of centimeters of new snow is expected over the next 24 hours and only dribs and drabs over the remainder of the week.  Winds are expected to remain in the moderate to strong values range.  Temperatures will rise as the week progresses.

Avalanche Summary

A few loose dry sluffs from extreme lee aspects.  No other natural avalanche activity observed.

Snowpack Summary

Some redistribution of loose snow in all elevation zones with fresh slabs continuing to develop on lee aspects

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.