Looks like it's time to put away the summer clothes and get the jackets, scarves and gloves out from storage.
A storm system tracking into the Great Lakes area is bringing a bout of cool weather to Ontario and Quebec this week, and some regions are expected to see some lake effect snow as it passes through.
The prairies have already seen a dusting of snow from this weather system as it moved up from the United States over the weekend. Southwestern Manitoba reportedly saw snowfall on Saturday night, residents of Saskatoon woke up to snow this morning, and Regina has been seeing snow and freezing rain since early this morning. Further to the east, rain has switched over to snow in Thunder Bay this afternoon, and regions north of Lake Superior, including Geraldton, Manitouwadge and Hornepayne, are now under an Environment Canada snowfall warning. They're expected to get between 10 and 15 cm of snow by evening, and possibly another 2 to 4 cm on top of that overnight.
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As the system continues to move further east, winds blowing off the lakes are expected to push bands of cold rain on-shore, mainly across the Sault Ste. Marie area, through cottage country and over the Niagara Peninsula. However, with cooler overnight and morning temperatures, those bands of rain could easily turn to lake-effect snow flurries, especially in those areas of higher elevation.
At the moment, the earliest we'll see lake effect snow seems to be for Friday morning, but with overnight temperatures dropping into single-digits (or lower) throughout the week, there's a decent chance that some regions could see some flurries on Wednesday or Thursday morning as well.
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