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Avalanche Forecast

Archived

Feb 1st, 2020–Feb 2nd, 2020

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

Regions

Glacier.

Elevated avalanche danger, avoid all avalanche terrain.

Weather Forecast

Periods of snow with accumulation around 16 cm. Alpine temperature -3 C accompanied by westerly winds strong gusting to extreme (50 km/h gusting to 105 km/h). The freezing level of 1700m. Later today cold air should usher in bringing a rapid drop in temperature and an alpine low temp tonight of -17C

Snowpack Summary

20cm+ storm snow then a shift to rain below 2000m with strong S'ly winds will be destabilizing the upper snowpack. Extreme S'ly winds and snowfall will be forming storm slab well down lee slopes. with The mid and lower snowpack is well settled, our persistent weak layers are being tested by this warm storm.

Avalanche Summary

A widespread natural avalanche cycle is occurring now and should continue until temperatures rapidly cool this afternoon. Highway avalanche control is producing moist slides to size 3.5 running to the bottom of the runouts.

Confidence

Due to the number and quality of field observations

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.