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Avalanche Forecast

Archived

Feb 26th, 2022–Mar 1st, 2022

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

Regions

Waterton Lakes.

Extreme NW and SW winds have are cross loading slopes and creating hard windslab in lees.

Weather Forecast

Sunday: Cloudy with scattered flurries. Strong SW winds at ridgetop. Alpine high -5. Freezing levels 1200m.

Monday: Cloudy with flurries, amounting to 15 cm. Strong SW ridgetop winds. Alpine high -1. Freezing levels 1800m.

Tuesday: Cloudy with flurries, amounting to 10 cm. Moderate SW winds gusting extreme. Alpine high -1. Freezing levels 1900m.

Snowpack Summary

Strong to extreme winds have formed hard windslabs 10-30cm deep. This overlies pressed surfaces and old hard windslab 10-30 cm deep, or Feb crust. Feb 15 crust is 1 cm thick and exists to tree line all aspects and higher on solar aspects. Well settled midpack. Facets above Dec 4 crust, beginning to break down, buried 150-200 cm.

Avalanche Summary

A few natural wind slab avalanches have been reported in the park up to sz 2 this week. Thanks for the great observations on the Mountain Information Network, we love seeing your adventures.

Confidence

Intensity of incoming weather systems is uncertain

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.