By 10 p.m., an unofficial one-day record of 123 millimetres of rain had fallen at Pearson, exceeding the 121.4 millimetres that fell during Hurricane Hazel on Oct. 15, 1954.
To put that in perspective, the city gets an average of 74.4 millimetres during the month of July. Overwhelmed, the Don River breached its banks on its lower stretches, spilling muddy water onto the parkway for the second time this season. Downtown near the Rogers Centre, a manhole cover vibrated and sprayed water like a crazed garden sprinkler as the pressure built up underneath. Another manhole nearby turned into a geyser.
Environment Canada meteorologist Mark Seifert says that two storms hit the city in short succession. Coming in from the northwest, they were sluggish giants -- not particularly violent, but heavy and slow. Because they took so long to traverse the city, they dumped an unusual amount of rain. And in an urban environment such as ours, covered in concrete and asphalt, "the rain really has no place to go."