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Avalanche Forecast

Archived

Jan 7th, 2017–Jan 8th, 2017

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.
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

Glacier.

High quality skiing and riding can be found in many locations. However slab avalanches can still be triggered on specific terrain features.

Weather Forecast

Today expect a mix of sun and cloud, no precip, an alpine high of -10 and wind SE @15km/h. Cloudy tonight, light snow on Sunday (up to 4cm) and 10cm on Monday with the freezing level rising to 1000m accompanied by mod to strong winds. By Wednesday the Arctic high pressure returns with frigid temps and clear skies.

Snowpack Summary

Previous strong N'ly winds hammered exposed slopes in the Alpine and at treeline. Leaving behind windslabs on specific locations, the Dec 26th surface hoar is spotty and doesn't exist in all locations. The December 18th interface is easier to find (50-80cm down) still producing hard results in tests with varying fracture character.

Avalanche Summary

On Wednesday, skiers accidentally triggered a size 1.5 windslab on a SW aspect at 2350m (see their MIN for details). In the region there were several similar reports of triggerable wind slabs up to 50cm deep. There have been no natural avalanches observed in the park for a few days. In addition there have been reports of cornices failing.

Confidence

Due to the number and quality of field observations

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.