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Avalanche Forecast

Archived

Jan 18th, 2012–Jan 19th, 2012

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

Regions

South Columbia.

Confidence

Good - -1

Weather Forecast

Thursday: One more day of frigid cold to endure - although some minor warming may creep into the far south. Light winds. No precipitation.Friday: Light snow starting late in the day. Moderate south-westerly winds and temperatures rising slightly. Saturday: Continued light to moderate snowfall. South-westerly winds.

Avalanche Summary

Skiers triggered wind slabs to size 2 on mostly easterly aspects on Tuesday. A couple of natural wind slabs up to size 2.5 were also reported. In terrain not so affected by the wind, natural and skier-triggered soft slabs and sluffs were observed on steep slopes and convex rolls.

Snowpack Summary

Recent storm snow totals are about 40-60cm. This sits over a variety of surfaces (facets, surface hoar in sheltered areas, soft slabs, hard slabs, wind crust, and a melt-freeze crust below treeline) The dry storm snow only been reacting as a slab in a few areas, with loose and fast sluffs the main concern in others. Localised strong winds on Tuesday night have led to wind slabs at treeline and above, mainly on easterly aspects.A surface hoar layer buried in mid-December is gaining strength, but professionals are still treating it with caution, as the consequences of an avalanche on this layer would be high. It's now down about 120cm in the snowpack and could potentially be triggered from a shallow snowpack area or by a very heavy load, like cornice fall or group of sledders).

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.

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.