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Avalanche Forecast

Archived

Feb 11th, 2018–Feb 12th, 2018

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

Regions

Kananaskis.

Conditions are still primed for human triggering.Click Here for SPAW:

Confidence

-

Weather Forecast

Monday is to bring sunny skies with cloudy periods. Alpine temperature is forecast to be -7c with west winds of 25km/h.

Avalanche Summary

Two new avalanches were observed within the last 24 hours: The Tent Bowl had one size 3 that ran to the bench with a crown depth up to 150cm. On the bed surface, you could see that the avalanche stepped down in many places.A second new avalanche size 2.5 was observed over Parallel Falls which ripped a slab of 80cm thick along the base of the falls.

Snowpack Summary

The alpine has a variety of wind effect that goes into tree line. This wind effect is on all aspects. Natural activity has slowed down but conditions still look primed for human triggering. Any avalanche that is triggered has a high likelihood to step down to the persistent deep layers. These layers include the Jan 18th and 6th surface hoar layers down being found below 2400m down around 1m+ and the Dec15th facet interface down 150cm being found all the way up and into the alpine. Stick to conservative terrain and minimize your exposure to overhead areas.

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.