Southern Ontario: Thunderstorm Outlook for Sunday, August 1, 2021

Forecast Discussion

Pop-up thunderstorms are possible throughout much of Southern Ontario during the afternoon and evening on Sunday. For the most part, these storms should remain non-severe although there is a very low questionable risk for some marginally severe storms mainly around the Lake Ontario shoreline and into parts of Central Ontario near Lake Simcoe. The main risks will include some strong wind gusts, moderate-sized hail and intense downpours that may lead to localized flooding. We should see the storm risk come to an end by the late evening as the storms move south and east of the border over Upstate New York.