A severe thunderstorm that fired up in parts of southern Ontario Tuesday brought dark clouds, heavy rain and frequent lightning to some communities.
According to Chris Scott, Director of Meteorology at The Weather Network, more than 4,000 lightning strikes were recorded over the course of one hour.
Strong winds also lead to downed trees and power lines in the Barrie area Tuesday afternoon.
Thousands of customers were left without power and traffic came to a standstill during the evening commute. Motorists were forced to treat some intersections as four-way stops as the storms knocked down traffic signals in the northern part of the city.
Meanwhile, heavy rain continues in the City of Thunder Bay and that has officials on high alert. Additional staff has been called in to monitor weather conditions in the city, which is in the midst of a massive clean-up following widespread flooding three weeks ago.
There's a risk for more isolated severe thunderstorms across parts of the province Wednesday.