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Avalanche Forecast

Archived

Mar 5th, 2022–Mar 8th, 2022

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

Regions

Waterton Lakes.

Storm slabs up to 100cm deep continue to be reactive on interfaces within the slab in snowpack tests. Asses storm slab carefully before committing to lines.

Weather Forecast

Sun: Mix of sun and cloud with isolated flurries. Light gusting moderate W winds. Alpine high -9. Freezing levels valley bottom.

Mon: Cloudy with  flurries in PM, 15cm overnight. Moderate W winds. Alpine high -7, low -11. Freezing levels VB.

Tues: Flurries, accumulating 5cm. Light gusting to moderate NE winds. High -14, low -18. Freezing levels VB.

Snowpack Summary

90cm of snow and mod SW winds formed storm slabs in ALP close to the continental divide. Rain crust found 30 cm down within storm snow up to 2000m. This overlies old windslab 10-30 cm deep. Feb 15 crust, 1 cm thick, exists to treeline all aspects and higher on solar aspects. Well settled midpack. Facets above Dec 4 crust, buried 150-250 cm.

Avalanche Summary

Evidence of a widespread natural cycle: wet loose, wet slab, storm slab avalanches, from this week's storm can be found in most valleys up to size 3. Check Forum Ridge Avalanche to see impressive size 3. Numerous dry loose avalanches up to 1.5 on all aspects in steep terrain. Please submit observations to the Mountain Information Network

Confidence

Timing of incoming weather systems is uncertain

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.