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Avalanche Forecast

Archived

Apr 8th, 2022–Apr 9th, 2022

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

Regions

Little Yoho.

We expect an All Freeze, No Melt scenario for the next several days as we start our transition into spring hazard ratings in the near future. Alpine windslabs are expected to remain sensitive with the added input of light snow and wind.

Weather Forecast

Freezing levels will drop to valley bottom Friday night as we return to winter for several days. Light flurries (5 cm) and moderate to strong SW winds for Friday night. For the weekend, expect a mix of sun and cloud, alpine highs of -9C and winds should taper off and be light from the west. For more details, see the Mountain Weather Forecast.

Snowpack Summary

10-20 cm of soft, dry snow sits on a firm crust on N aspects. On solar aspects a series of crusts exist in the snowpack at all elevations. Despite the warm temps in the last 24 hrs, the crusts remained supportive except at lower below treeline elevations on Friday. Windslabs exist in immediate leeward areas, and are still possible to trigger.

Avalanche Summary

FIeld trip near Sunshine Village on Wednesday observed a size 1.5 windslab/cornice on a SE aspect and a fresh cornice failure on the N side. In the past 2 days, there have been some reports of wind slabs being triggered up to size 1.5 in the alpine in the Lake Louise back country and below the Bow Hut.

Confidence

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.