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Avalanche Forecast

Archived

Feb 6th, 2015–Feb 7th, 2015

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

Regions

Sea To Sky.

Looks like the conditions will be downright atrocious through the weekend. With the ongoing deluge it's probably best to continue to avoid avalanche terrain.

Confidence

Fair

Weather Forecast

It ain't over yet. Freezing levels are expected to remain around 1800m for the next few days while the precipitation continues. We're expecting another 15 - 25mm of water Friday night accompanied by extreme SW winds. As for the duration of the period; 5 - 10mm on Saturday, 15 - 20mm Saturday Night, and 5 - 10mm Sunday. It doesn't look like it will be dry until Tuesday.

Avalanche Summary

On Friday we received reports of avalanches running to size 3 both naturally and with explosive control work on all aspects. There were also reports of cornice fall triggering large avalanches.

Snowpack Summary

The wet warm storm has produced 30 to as much as 100cm of snow above 2200m. The snow is wet below 2000m and saturated below treeline. Moderate to strong winds out of the SW through SE have likely formed deep slabs at upper elevations. All the new snow rests on the early February rain crust, and most of the avalanche activity has been on said crust. I have not heard of anything running below the crust at this point.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.

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.