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Avalanche Forecast

Archived

Mar 18th, 2021–Mar 19th, 2021

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

Regions

Glacier.

Fortitude and West Rogers Winter Restricted Areas will be closed today. Please respect all closures, the Winter Permit System requires 100% compliance!

Weather Forecast

The dominating ridge of high-pressure will succumb a cold front today, as a low-pressure system pushes onshore from the Pacific. This means we can expect a mix of sun and could during the day with precipitation starting tonight. The freezing level will peak today at 2200m, winds will be light from the south, but will gust strong.

Snowpack Summary

Spring melt-freeze conditions exist at lower elevations, and into the alpine on solar asp. The snowpack has even turned isothermal in the afternoon at lower elevations, on solar aspects. On Polar aspects at and above TL the surface snow remains dry, with a strong mid, and lower-snowpack. The March crusts and spotty unreactive SH is buried ~30cm.

Avalanche Summary

On Monday there were numerous avalanches up to size 3 in steep, rocky, solar facing terrain at lower elevations. There has been a decrease in activity over the last few days, with cooler overnight temperatures refreezing the snow surface; however, there has still been a few isolated avalanches that occurred later in the afternoon on solar aspects.

Confidence

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.