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Avalanche Forecast

Archived

Dec 9th, 2015–Dec 10th, 2015

Alpine
Natural and human triggered avalanches likely.
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.

Regions

Jasper.

Great skiing in sheltered locations at treeline. The bonding of the new storm snow is under investigation right now - keep an eye out for recent natural avalanche activity.

Weather Forecast

Snowfall amounts are tapering off, with only 5-10cm expected over the next 72hours in light scattered flurries. Temperatures are cooling as well, -15C overnight and freezing levels staying below 1200m. Winds shifting to the South on Thursday, then returning to a light Westerly flow by the weekend.

Snowpack Summary

60cm of storm snow in the past week sits on a variety of surfaces, ranging from a crust on steep solar aspects to the Dec3 surface hoar layer in isolated locations. This storm snow snow came in warm, is settling rapidly, and is forming a new slab condition, particularly in wind exposed areas.

Avalanche Summary

Poor visibility during this storm. No new avalanches observed, but natural activity is expected in the alpine. Expect shedding of loose snow from steep rocky terrain.

Confidence

Due to the number of field observations

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.

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.