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Avalanche Forecast

Archived

Jan 12th, 2019–Jan 13th, 2019

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

South Coast.

A warming snowpack can quickly lose strength and produce loose-wet avalanches. Be suspect of alpine slopes and cornices with the warm alpine temperatures.

Confidence

Low - Timing or intensity of solar radiation is uncertain

Weather Forecast

SATURDAY NIGHT: Cloudy with clear periods. Light south-southwest wind. Alpine temps +4 C, freezing level 2200mSUNDAY: Mix of sun and cloud. Light southwest wind with occasional moderate gusts. Alpine temps reaching +10 C, freezing level above 2500 m.MONDAY: Sunny with cloudy periods. Light southeast wind. Alpine temps reaching +10 C, freezing level 3000 m.TUESDAY: Sunny with cloudy periods. Light east wind. Alpine temps reaching +6 C, freezing level 2300 m.More details can be found in the Mountain Weather Forecast.

Avalanche Summary

On Friday, loose wet avalanches released naturally below 1200 m. Skiers were able to trigger loose wet avalanches which ran on an ice layer down 15-20 cm.This region has had limited observations. Please submit any observations you have to the Mountain Information Network here.

Snowpack Summary

Rising freezing levels have moistened surface snow at all elevations. Dry snow may still be found on north aspects in the high alpine. Cornices have grown and are suspect to fail with warming.At alpine and treeline elevations in the north of the region, 70-100 cm recent storm snow is settling. A melt freeze crusts exists below this with associated facets (sugar snow), however the recent snow appears to be settling well on this interface.

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.