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Avalanche Forecast

Archived

Feb 19th, 2013–Feb 20th, 2013

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

Regions

Kananaskis.

Another 5cm+ through Tuesday night with a clearing trend on Wednesday. Sluffing is a concern, especially on solar aspects when the sun is shining. Watch for increased storm slab development in alpine areas.

Confidence

Good

Weather Forecast

Another 5cm+ expected Tuesday night with light winds. Wednesday should see a clearing trend with cool alpine temperatures and a fair amount of sun. Winds will be light and variable. It is a long away at the moment, but a significant storm is on the radar for late Friday.

Avalanche Summary

Nothing new observed or reported. Some minor snow-balling in steep solar aspects at lower elevations.

Snowpack Summary

Storm snow is settling and still showing very little wind effect below 2300m. Sun crust buried 7 to 10cm on solar aspects. Buried wind slabs are still found in alpine and treeline areas, but have been unreactive to stability tests. Snowpack at lower elevations is very weak and facetted, with numerous whumpfs experienced today.

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.

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.