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Avalanche Forecast

Archived

Dec 21st, 2017–Dec 24th, 2017

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.
Below Treeline
Natural avalanches unlikely.

Regions

Waterton Lakes.

Strong winds have moved lots of snow around. Watch for wind slabs.

Weather Forecast

5-10cm of snow forecasted overnight Thursday and a trend to colder temperatures with daytime highs below -10 C and windchill values below -20 C. Winds will die down from strong (40km/h+) Thursday night and look to remain "only" in the moderate range (20-40km/h) into the weekend.

Snowpack Summary

Strong west winds have scoured ridge-tops and exposed terrain down to valley bottom. The snowpack at 1650m is 53cm. Below tree-line but above 1600m has a crust/facet combo at the bottom on the snowpack.

Avalanche Summary

No new observations

Confidence

Due to the number and quality of field observations

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.