Floods in Quebec, Canada during July 2023.
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Info on the weather event:
Around July 10 to 12, record rains led to dramatic rises in Québec waterways leading to flooding and evacuations from Saguenay to Sherbrooke. More than 135 mm in less than 48 hours sent rivers surging, including the St-Francois River which rose from 2 to 6 m in less than four hours. By the end of July, Sherbrooke recorded three times its normal monthly total. Early on July 12 and into the next day, severe thunderstorms moved through southern Ontario and Québec causing flash flooding and wind damages from tornadoes. Rainfall totals ranged from 50 to 80 mm from Sarnia to Orillia and 50 to 90 mm of rain through the St. Lawrence Valley in Québec, including another 90 mm dump in Montréal.

On July 20-21, another classic undercutting cold front of warm humid air triggered a series of supercell thunderstorms travelling from near Windsor to southern Québec. The weather featured microbursts, tornadoes, hailers with baseball-size hail and torrential flash floods. Joliette, Québec received the most rainfall, between 100 to 120 mm, with most of it within two hours. Barely a week later, a series of severe thunderstorms dropped more heavy rains resulting in flash flooding from Southwestern Ontario to Québec City. Storms led to widespread street flooding and left 55,000 without power. On August 3, more storms moved through southern Ontario and Québec, packing billiard ball-size hailstones, violent wind gusts in excess of 110 km/h and torrential downpours. On August 10, between 80 to 120 mm of rain in about an hour and a half fell across Montréal. Roads and underpasses were submerged along with warehouses, schools and lower levels of shopping malls. In Ottawa, with 100 mm of rain in six hours, roads became canals. To avoid flooding, motorists drove on sidewalks or abandoned their cars. Two weeks later a steady stream of showers and thunderstorms pushed through southwestern Ontario on August 23 and 24 bringing storm rainfalls as much as 185 mm to several locations. Flooding led to road washouts and the tragic death of a trucker who perished in a 3-m deep sinkhole. Greatest rainfall totals exceeded 200 mm in Pelee Island and Harrow, Ontario. Some of the moisture came from the remnants of Tropical Storm Hilary from Mexico via British Columbia and the prairies. Insurance costs to property losses from some of the more impactful storms this summer in Ontario and Québec totalled more than three quarters of a billion dollars.

Source:https://www.canada.ca/en/environment-climate-change/services/top-ten-weather-stories/2023.html