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Avalanche Forecast

Archived

Feb 19th, 2022–Feb 20th, 2022

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

Regions

Glacier.

The fresh snow is a welcome sight to see, but the resulting storm slabs may be sensitive to human triggering. Assess the snowpack carefully before committing to your line.

Weather Forecast

Flurries are expected throughout the day on Sunday with accumulations up to 5cm. The freezing level will remain at valley bottom with an alpine high of -10. Ridge top winds will be 10-20km/hr from the North as the Arctic Polar Plunge moves into our region, gradually dropping temps into the -20's again for a few days. Clearing skies by Tuesday.

Snowpack Summary

The accumulating storm snow (~50cm) buried small surface hoar (Feb 15 SH 2-8mm) in sheltered areas below tree line, a crust on steep solar slopes and firm wind affected surfaces in the alpine. The Jan 29 surface hoar is down 70-120cm and is breaking down. Wind affected snow in the alpine and down into tree line.

Avalanche Summary

On Saturday, natural avalanche activity was observed up to size 3.0 and artillery controlled avalanche results up to size 3.5. Cheops North 4 was reported to be down into the creek, sz 2.5-3.0.

Numerous human triggered storm slab avalanches on Friday up to size 1.5.

Confidence

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 Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.