More heavy rain expected across southern Quebec

Laval, Québec on Friday August 9. More rounds of showers and thunderstorms are possible on Sunday, with 30-40mm falling on already saturated ground across the Montreal region. The summer of 2024 is quickly becoming know as the summer of the flood. Major flash flooding has now occurred on two separate occasions in both Toronto and Montreal as well as across Vermont and New York. (Association des Pompiers de Laval)

Special Weather Statement in effect for southern Quebec and eastern Ontario for 30-40mm of rain from Sunday afternoon into Monday morning. Some flooding and water accumulation is possible, especially in low-lying areas.

A common scene this summer in central Canada. This time is was Mississauga, Ontario on Saturday. (TWN)

Low pressure and a frontal boundary will slowly move across southern Quebec over the next 36 hours, generating showers and thunderstorms. Some of the showers will be slow moving, and capable of producing heavy rain. This will not be like tropical storm Debby on August 9. The storms will be scattered in nature and the hope is that the rain will spread out and not concentrated. However the ground is saturated in southern Quebec and waterways are full, so any additional rainfall is not welcome at this time.

Showers will be possible through Wednesday of the upcoming week, along with much cooler temperatures by Tuesday.

The summer of 2024 is quickly becoming known as the summer of the flood across eastern Canada. For the second time this summer, as with Montreal, the GTA experienced major flooding on Saturday. The culprit is an upper level low slowly moving across the Great Lakes and heading for southern Quebec. On Saturday, the low developed rounds of thunderstorms that moved off Lake Ontario and into the Toronto region dumping 128.3mm of rain at Pearson Airport. 

Toronto has now had its wettest summer on record, with 475.8mm falling, smashing the 2008 record of 396mm. Montreal is not far behind, with 415.8mm since June 1st at Trudeau Airport. There has been even more precipitation at other locations across southern Quebec. The trend will persist with more rounds of storms expected today and showers through the middle portion of the week.

The storms also generated a tornado with significant damage near the communities of Drumbo and Ayr in southwestern Ontario. The damage will investigated today by the Northern Tornadoes Project from Western University to determine the rating.