A cold front will arrive Friday to push away all the hot weather and make way for cooler temperatures this weekend. This change in weather regimes comes with a price - the potential for extreme rainfall. Thunderstorms with embedded torrential rain will exist between the two air masses and take a big chunk of Friday to cross the region. Some locations could see rain so heavy that flash flooding becomes a risk.
Scattered thunderstorms travel slowly through the region on Friday, with embedded areas of very heavy rain. The best opportunity for the stormy weather is between 9 a.m. to 9 p.m. Some isolated locations could see over 50 mm of rain in a short time to cause flash flooding. Temperatures will only climb to near 25°C with an east wind that becomes northwesterly in the evening as the cold front moves out of the region.
Saturday will be mostly sunny, but gusty northwest winds will keep daytime highs near 25°C - it'll be a few degrees cooler for folks close to Lake Superior.
Sunday brings mostly cloudy skies with a slight risk of an afternoon shower and daytime highs near 23°C. Temperatures bounce back and forth around more seasonal values for mid-July in the coming week.