Southern Ontario is bracing for another round of severe thunderstorms Wednesday, following overnight storms that triggered Canada’s first tornado warning and red alert of the year in the Windsor area.
Severe Weather Threat Continues
The system responsible for Tuesday’s storms is moving eastward, bringing warm frontal showers to eastern Ontario. Still, southwestern Ontario remains in the path of potentially severe weather. By Wednesday afternoon and evening, the region could experience heavy downpours, large hail, and a slight chance of rotating storms near Windsor.
Timing and Risks
Severe thunderstorms are forecast to begin near Windsor and Sarnia between 1 p.m. And 2 p.m. On Wednesday, then move eastward, reaching Hamilton and the Greater Toronto Area (GTA) after 4 p.m. The elevated thunderstorm energy from warm weather creates a risk of 30-50 mm of rainfall.

The threat doesn’t complete with Wednesday. Another round of strong thunderstorms is expected Thursday morning in Windsor and Thursday afternoon in the GTA.
Looking Ahead
Another system is forecast to bring rain and embedded thunderstorms to Windsor, Sarnia, and London early Thursday morning. This system is then expected to move into the GTA and Cottage Country by the afternoon.
Frequently Asked Questions
What areas are most at risk on Wednesday?
Severe thunderstorms are forecast Wednesday afternoon, starting near Windsor and Sarnia by 1-2 p.m. And reaching Hamilton and the Greater Toronto Area (GTA) after 4 p.m.
What are the primary risks associated with these storms?
The risks include large hail and 30-50 mm of rain due to elevated thunderstorm energy from warm weather. There is also a low to slight chance of a rotating storm near Windsor.
Is more severe weather expected after Wednesday?
Another round of strong thunderstorms is expected Thursday morning in Windsor and Thursday afternoon in the GTA.
As these weather systems move through, how will you ensure you and your family stay safe and informed?
