ONTARIO: Thunderstorm Forecast for Sunday, May 7, 2023

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On Sunday, there continues to be the risk of isolated thunderstorms coming in two waves for parts of Southwestern and Central/Eastern Ontario. The first round will come Sunday morning in Deep Southwestern Ontario with a decaying line of thunderstorms crossing the border from Michigan.

Later in the day, we expect to see an area of rain move across Georgian Bay and across parts of Central and Eastern Ontario. Some embedded thunderstorms are possible within this rainfall during the afternoon and early evening hours.

Despite earlier indications, all storms are expected to remain non-severe on Sunday. The isolated severe risk for Southwestern Ontario is looking less probable due to the morning precipitation taking longer to move out. This slow-moving precipitation will lead to reduced daylight heating which is required for the storms to develop. As such, we have dropped the severe risk zone in our updated forecast.