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Avalanche Forecast

Archived

Dec 7th, 2017–Dec 8th, 2017

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

Regions

North Columbia.

Seek the shade for the best and safest riding.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

FRIDAY: Sunny and warm above valley cloud. Light wind. Freezing level near 3000 m with a colder air layer in the valleys.SATURDAY: Sunny and warm above valley cloud. Light wind. Freezing level near 2700 m with a colder air layer in the valleys.SUNDAY: Cloudy. Moderate south-west winds. Freezing level near 2600 m. More details can be found in the Mountain Weather Forecast.

Avalanche Summary

On Wednesday, only minor sluffing was reported. On Tuesday, explosive avalanche control in the Monashees produced a few size 1.5 slabs running on the November crust on northwest-facing slopes at treeline. A large 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.

Snowpack Summary

Intense warming will melt and weaken upper snowpack layers, particularly on steep sunny slopes. Warming also has the potential to wake up more deeply buried crust layers which formed in November and October. On the whole, these crusts have been showing reasonable bonding in snowpack and slope tests. There has been the odd isolated exception, and a cautious approach is a good idea while temperatures are skyrocketing. 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.