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Avalanche Forecast

Archived

Dec 15th, 2019–Dec 16th, 2019

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

Regions

Jasper.

Varied and inconsistent results from snowpack tests. Very little evidence of an active weakness in the snowpack, though there are a number of distinct layers.

Forecasted new snow not expected to overload deep instabilities.

Weather Forecast

A weak ridge is prevalent over BC and Alberta. Sun and cloud expected in the forecast area with precipitation moving into BC late this afternoon. Isolated flurries will reach the Rockies Monday, though actual load uncertain right now.

For more details: Mountain Weather Forecast

Snowpack Summary

The top 30cm remains unconsolidated except where exposed to wind and soft slabs may have been formed. The snow depth is variable at all elevations. There is a crust/facet layer distributed through the region in the mid-pack with mixed reactivity and a weak basal facet/depth hoar layer at the base of the pack.

Avalanche Summary

No new avalanches observed or reported. Add or View your weekend trip reports here at the CAA's Mountain Information Network

Confidence

Intensity of incoming weather systems is uncertain on Monday

Problems

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.