High heat - smog and humidity
The weather in the east has become extremely hot and humid. A smog warning is in effect for most of southern Ontario. Very poor air quality has also resulted in an Air Stagnation Advisory for the northern counties of New York State. A High Heat and Humidity Warning has been posted for southwest Quebec.
As of 4pm, Kemptville had reached 32C with a Humidex value in the dangerous range at 42C. Brockville had a reading of 43C to be the highest in the province. Montreal was at 32C. A Severe Thunderstorm Watch is now in effect for most of eastern Ontario. Heavy Thunderstorms are possible in the tropical air through tonight as a cold front presses east.