A severe thunderstorm watch has been issued for Montreal on Thursday, after our first heatwave of the season produced three consecutive record highs at Trudeau Airport. The watch covers a large portion of southwestern Quebec and eastern Ontario. Storms are expected to develop along a cold front moving east across Ontario.
The main threat for theses storms will be heavy rainfall, up to 50mm locally. Additionally strong winds will be possible as well. The heavy rain will result in some flash flooding along with ponding of water on area roads.
The front unfortunately will introduce a rather lengthy stretch of cooler and damp weather into the weekend, with frequent showers expected. This will put a wee bit of a damper on the weekend activities associated with the Formula F-1 Grand Prix du Canada, scheduled for Sunday at 2pm at Circuit Gilles Villeneuve.
The first heatwave of the season this past week was quite impressive, breaking three record highs for Monday through Wednesday at Trudeau Airport. On Monday the high was 30.8C (88F), breaking the 1967 record of 30.6C (87F). Tuesday's high of 31.4C (88F) surpassed the 1963 high of 30.6C (87F). Finally on Wednesday, Montreal reached 31.7C (89F), beating the 1967 record of 30.6C (87F).
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