North Columbia

The storm snow is settling out nicely below treeline, but there's been a ton of wind over the last 72 hours and we have limited alpine observations. Factor the potential for large human triggered avalanches at above treeline into your travel plans.

High -

Someone or something is playing with the storm switch, flipping it back and forth. Storm on, storm off, storm on. We get a brief respite Monday which may even offer a bit of sun. Another storm approaches the coast moving through the interior on Tuesday/Wednesday.SUNDAY NIGHT: Freezing level at valley bottom, light southwesterly breeze at most elevations with strong west wind at ridgetop, 1 to 5 cm of snow possible.MONDAY: Broken cloud cover, clearing through the day, freezing level at valley bottom, light southwest wind at most elevations, moderate west wind at ridgetop, a few centimeters of snow  possible.TUESDAY: Clear skies at dawn with cloud cover steadily increasing through the day, freezing level at valley bottom, light variable wind, no significant precipitation expected, trace of snow possible Tuesday night.WEDNESDAY: Overcast, freezing level at valley bottom, light variable wind at most elevations with moderate southwest wind at ridgetop, 1 to 5 cm of snow possible.

On Thursday and Friday a widespread natural avalanche cycle produced avalanches that averaged size 2, but storm slab avalanches as large as size 3.5 were reported from steep alpine features. A few different cornice failure events also produced very large avalanches. 

Thursday and Friday's storm produced 40 to 80 cm of new snow accompanied by moderate to strong wind generally out of the south. Wind effect is widespread in the alpine as well as isolated features at treeline. A 1 to 2 mm "zipper" (melt/freeze/mist) crust under the new snow has been reported in the mountains surrounding Revelstoke. Below this the snowpack is generally strong and well settled. At the bottom of the snowpack is a crust that formed in late October which is considered dormant at this time.