While most people were still sleeping early Wednesday morning, Environment Canada was actively tracking a thunderstorm that produced frequent lightning and heavy downpours in the London area.
The national weather agency issues a special weather statement just before 4 a.m., warning that heavy downpours could result in 20 to 40 mm of rain in an hour.
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Officials said that wind gusts up to 80 km/h and local power outages were also possible.
The statement ended just before 6 a.m. Wednesday.
Environment Canada issued a similar warning Tuesday, as the area received a significant amount of rain throughout the morning.
A heat warning has also been issued as the region braces for severe heat and humidity from now until the close of the workweek.
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