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Avalanche Forecast

Archived

Mar 13th, 2021–Mar 14th, 2021

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

Regions

Glacier.

The freezing levels will spike in to the alpine for the first time this week, avoid exposure to large south facing slopes and overhead cornices during the heat of the day.

Weather Forecast

A ridge of high pressure will keep the park dry for the next few days.

Saturday: Sunny.  Alpine high +1 C.  Light S wind. Freezing level (Fzl) 2500m

Sunday: Sunny, increasing cloud late in the day. Low -2 C, High -1 C, Fzl 1900m

Monday: Mostly Cloudy. Low -6 C, High -3 C. Fzl 1700m

Snowpack Summary

Up to 50cm of new snow in the past week is still cold and dry on north aspects, and has been through several melt freeze cycles on south aspects. A breakable suncrust can be found down 15cm in open areas and a second crust down 25cm on all aspects to treeline, higher on solar aspects. The mid and lower snowpack is generally settled and strong.

Avalanche Summary

Fresh cornice activity was reported off of the North side of Cheops Friday afternoon.

In the western Selkirks a skier was fully buried in a sz 2 stormslab they triggered on a SE aspect on Thursday.

Confidence

Freezing levels are uncertain

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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.