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Avalanche Forecast

Archived

Dec 26th, 2021–Dec 29th, 2021

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

Regions

Waterton Lakes.

Ridgetop winds are forecasted to increase tomorrow afternoon and there is lots of snow available for transport. Be on the lookout for windsalbs developing throughout the day.

Weather Forecast

Monday: Partially cloud with a chance of flurries in afternoon. Cold temps rising slightly to a balmy -18 throughout the day.

Tuesday: Partially cloud with a chance of flurries in afternoon. High -15.

Wednesday: Clearing with the return of cold temps High -18 Low -27.

Snowpack Summary

90-60 cm of unconsolidated storm snow sits atop previous windslabs 40-60 cm thick .This overlies facets above the Dec 4 crust. A 20-60 cm thick Nov MFcr complex completes the snowpack to ground. HS at TL is 130 - 180.

Avalanche Summary

No new avalanches reported in park with very limited visibility in the last few days. If you go out into the mountains please share your observations on the Mountain Information Network.

Confidence

Wind speed and direction 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.

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.