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Avalanche Forecast

Archived

Jan 21st, 2022–Jan 24th, 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 possible, human triggered probable.
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

Waterton Lakes.

Temperatures may rise rapidly on Saturday with strong alpine inversions and remain high throughout the weekend.

Minimize overhead hazard wherever possible.

Weather Forecast

Sat: Cloudy with isolated flurries. Moderate west winds. Strong alpine temperature inversion. Freezing rising to alpine throughout the day.

Sun: Cloudy with isolated flurries. Moderate W winds. Strong alpine temperature inversion with temps remaining above freezing.

Mon: Cloudy with sunny periods. Light W winds. Alpine high -6. FL valley bottom.

Snowpack Summary

A hard rain crust exist on all aspects up to 2000m. Alpine surfaces range from hard windslab in lees and to bare ground. Well settled midpack. Facets above Dec 4 crust down 150-200 cm. A 20-60 cm thick Nov crust complex completes snowpack to ground.

Avalanche Summary

No new avalanches reported or observed today. Limited field observations. Thanks to everyone posting on the Mountain Information Network, keep up the great work, we really do read them.

Confidence

Freezing levels are uncertain

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.