It's official: Southern Ontario sees its rainiest month on record
Slow-moving, scattered storms on Tuesday provided just enough rain for Pearson International Airport to record its rainiest month on record -- beating the previous record by one millimetre
Only two weeks after a series of training storms caused major flooding across southern Ontario, a slow-moving disturbance ushered in a very muggy air mass on Tuesday, increasing the threat of flooding across parts of southern Ontario once again.
Toronto and the rest of southern Ontario has seen more than its fair share of rain this July, as an anomalous amount of atmospheric moisture has been funneled into the province from stateside.
The month started off with the remnants of Hurricane Beryl sweeping into the region, bringing widespread torrential rains and winds.
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Only a week later, on July 16, Toronto saw 97.8 mm of rain fall, making meteorologists consider that that this could be the new rainiest month on record for southern Ontario.
On Tuesday, Toronto's Pearson airport needed less than six millimetres of rain to bring its rainiest month on record.
Precipitation began Tuesday morning near Lake Erie, with additional rounds of thunderstorms expected through the afternoon and evening across southern Ontario.
A lack of winds in the upper atmosphere made the storms slow-moving, so torrential downpours of 30-50+ mm per hour were possible in the heaviest storms.
While it was uncertain whether or not the storms would reach the Greater Toronto Area (GTA), air breezing off Lake Ontario gave the atmosphere the push it needed to produce a downpour.
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This helped to bring the Pearson International Airport's monthly total to 214.8 mm, higher than the previous record set in October 1954, when 213.8 mm of precipitation fell with impacts from Hurricane Hazel.
While last week's storm dumped just 30 mm of rain, prompting DVP flooding and Lake Shore Road closures, this storm managed to miss the downtown core and avoid further flooding.
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