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Avalanche Forecast

Archived

Nov 29th, 2019–Dec 2nd, 2019

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

Regions

Waterton Lakes.

Snowfall amounts from Wednesdays storm are highly variable. Areas that have enough snow to ski will likely have Windslab. The Akamina Parkway remains closed to public access due to construction.

Weather Forecast

Saturday: Sunny with cloudy periods. Light SW winds. Alpine high of -6 .

Sunday: Mix of sun and cloud.  Light to moderate SW winds. Alpine high -4

Monday: Mainly cloudy with isolated flurries. Moderate SW wind.

Snowpack Summary

Wednesday's upslope storm deposited up to 70 cm of  dry snow on the Eastern slopes of Waterton Park. Pockets of reactive windslab exist in the Alpine and at tree line. This new  windslab overlies a variety of bed surface including bare ground, old windslab and a thick melt freeze crust where snow from the late September snowfall did not melt out.

Avalanche Summary

Natural Loose Dry avalanches up to size 1.5 occurred in the front ranges during the previous storm cycle. No new avalanches observed in the past 24 h.

Confidence

Due to the number of field observations on Friday

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.