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Avalanche Forecast

Archived

Feb 12th, 2014–Feb 13th, 2014

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

Regions

Kananaskis.

Up to 35cm of new snow has fallen over the past 36hrs.  New snow means new turns but remember, MANY accidents happen right after a new snowfall when people are excited to get out.  Slowly work into terrain and dont let your keeness override judgement

Confidence

Good

Weather Forecast

The storm that just passed over us is beginning to peter out but we may squeeze another 5cm of so out of it.  Winds on Thursday are expected to become more south westerly and gust into the moderate range.  New snow is expected to trickle in all week and temperatures are expected to be pretty much average for this time of year...

Avalanche Summary

Conditions were obscured throughout the day on Wednesday and as a result, we were unable to get a good look into many start zones.

Snowpack Summary

Up to 35cm of recent storm snow has fallen at treeline elevations with variable winds that have been gusting into the moderate range.  This new snow is falling on a variety of snow surfaces from crusts on solar aspects to facets and surface hoar on more polar aspects.  Carefully evaluate this bond as we expect it to be very touchy in many areas.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.