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Avalanche Forecast

Archived

Dec 30th, 2012–Dec 31st, 2012

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

Regions

Glacier.

Solar radiation from clearing skies will have an affect on cornices. Keep an eye on those overhead hazards.

Weather Forecast

A ridge of high pressure is slowly moving east. Expect some overcast skies to be clearing as the day progresses. No precipitation is forecast. On Monday and into Tuesday, the ridge will remain over the province giving mostly clear skies, alpine inversions with some valley cloud and dry conditions.

Snowpack Summary

A profile yesterday on Mt Macdonald West Shoulder, 2185m, 38 degree slope, West aspect showed a height of snow of 200cm. Low density snow in top 20cm. The November 6 crust is down 160cm. Moderate to hard, sudden planar, test result down 42cm on decomposing forms. The Dec 25 surface hoar layer is down 15cm, more prominent between 1500m-2000m.

Avalanche Summary

2 size 2 natural loose avalanches yesterday east of the Rogers Pass summit.

Confidence

Due to the number and quality of field observations

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.