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Avalanche Forecast

Archived

Dec 9th, 2017–Dec 10th, 2017

Alpine
Natural avalanches unlikely.
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.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

South Columbia.

Seek the shade for the best and safest riding.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

We'll see little change in the weather pattern: valley cloud and cool temperatures down low but sunny and warm up high. SUNDAY: Cloudy with sunny breaks. Light to moderate south-west winds. Freezing level near 1700 m.MONDAY: Sunny with cloudy periods. Light wind. Freezing level near 1500m with an above freezing layer at 3000 m. Alpine high temperatures near +3.TUESDAY: Sunny with increasing cloud in the afternoon. Light wind. Freezing level near 2000 m with a colder air layer in the valleys.

Avalanche Summary

On Friday, a Size 2 dry loose avalanche was reported at 2300m on a south east aspect near Rogers Pass. A size 3 slab failed at ground near Revelstoke on a sunny aspect at treeline last week. Check out the report here. On Tuesday, a size 3 natural avalanche was reported on a steep north-facing alpine face in the Selkirks. The failure layer is unknown, but it was likely an early season crust. There have been other, old large avalanches spotted on high, north east facing slopes just below ridge crests on Youngs Peak and also Hassler Peak.

Snowpack Summary

Warming temperatures will melt and weaken upper snowpack layers, on isolated steep sunny slopes. Warming also has the potential to wake up more deeply buried crust layers which formed during November's rainfall. On the whole, these crusts have been showing reasonable bonding in snowpack and slope tests. Isolated wind slabs may still be found behind ridges and ribs. Below treeline, the snowpack is shallow--look out for early season hazards like open creeks and tree stumps.

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.