Falling temperatures are prompting extreme cold warnings in parts of Canada . Quebec is under a flash freeze warning, with temperatures dropping 10 degrees. Extreme cold warnings are in effect for northern Quebec .
In southern Ontario, arctic fronts will prompt lake-effect snow. The lower Great Lakes areas, including Toronto, will have a cold Saturday and morning wind chills will hit the -20s. Parts of Ontario are under a dense fog advisory Friday morning.
Canada Extreme Cold Warnings Quebec Ontario Arctic Fronts Lake-Effect Snow Great Lakes Toronto Fog Advisory