It’s looking more and more likely that our weather pattern will undergo a bit of a switch over the next week or so. We saw the first indications of this early in the week, as a Colorado low brushed southeastern areas and brought the first heavy snow event of the year to this region.
No cold air was in place to move in behind this low, so it looks like temperatures will continue on the mild side, at least until the weekend. During the second half of this week, a second, less organized area of low pressure will slide through Manitoba, bringing clouds and flurries with it. Temperatures will continue to be mild with highs around -5 C and overnight lows in the -10 to -15 C range.
Over the weekend this system will pull off to the east and intensify. At the same time, another fairly strong storm system will move in from the Pacific. This second system is forecast to move south of us as a large area of cold arctic high pressure begins to drop southward. This push of cold air looks as if it will move into our region around Sunday and will likely stick around for most of the week. This just might bring the longest cold snap of the season.
Luckily, winds look to be light with high pressure overhead, so while overnight lows might get pretty cold, with the increasing early-spring sunshine, daytime highs will not be too bad.
The models show more active weather later next week, so there is still a chance of seeing some significant snowfall before spring really moves in.
Usual temperature range for this period: Highs, -15 to 0 C, lows, -27 to -10 C.