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Avalanche Forecast

Archived

Dec 13th, 2020–Dec 14th, 2020

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

Jasper.

Even with low danger ratings avalanches are still possible.

Weather Forecast

Parker Ridge Area

Monday: Cloudy with sunny periods and isolated flurries. Precipitation: Trace. Alpine temperature: High -8 °C.  Ridge wind SW: 10-30 km/h.

Tuesday: Flurries. Accumulation: 6 cm. Alpine temperature: Low -10 °C, High -9 °C. Ridge wind southwest: 15 km/h gusting to 45 km/h.

Snowpack Summary

The storm snow is unconsolidated and faceting with the cold temps while overlying a variety of surfaces ranging from old hard wind slab, facets and crusts on steep solar aspects. The bottom of the snowpack is continuing to facet.

Avalanche Summary

Good visibility around the Hilda Zone today. A few loose dry avalanches were observed to sz 1.5 on steep alpine features.

Confidence

Timing, track, or intensity of incoming weather system is uncertain on Wednesday

Problems

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.

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.