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Avalanche Forecast

Archived

Feb 24th, 2020–Feb 27th, 2020

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

Regions

Waterton Lakes.

10-20cm of recent storm snow has fallen on a variety of surfaces, and slabs will become increasingly reactive with sun and strong winds on Tuesday.

Weather Forecast

Tuesday: Sun and cloud with isolated flurries, and moderate SW ridgetop winds. Alpine high -9 with an inversion settling in overnight.

Wednesday: Similar to Tuesday with strong NW winds at ridgetop

Thursday: Mainly cloudy with flurries, continued strong NW winds and a high of -7.

Snowpack Summary

10-20cm of low density new snow sits on a variety of wind affected surfaces including previous windslab, suncrusts and the February 1 melt freeze crust, which exists up to approx 2100m. As winds increase this new snow will be blown into windslabs in lee areas. The midpack is strong, though weaker basal facets can be found in thin areas.

Avalanche Summary

Neighbouring operations reported skier triggered avalanches to size 1 in the new storm snow on Sunday.

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.