Southern Ontario: Thunderstorm Outlook for Thursday, July 1, 2021

Forecast Discussion

Non-severe isolated pop-up thunderstorms are possible throughout Central, Eastern, Extreme Southwestern Ontario and around the GTA/Niagara region during the afternoon and evening on Thursday. These storms will be extremely isolated and not everyone will see them. Locations that do see the storms could be dealing with some flash flooding as there is the potential that these slow-moving storms could ‘train’ over a region for hours bringing 50-100mm locally. Other risks include strong wind gusts, small hail and frequent lightning strikes. Rain with embedded thunderstorms could continue into the overnight hours for Eastern and Central Ontario.