Southern Ontario: Thunderstorm Outlook for Sunday, July 18, 2021

Forecast Discussion

Isolated slow-moving thunderstorms are expected to develop across Eastern, Central and Northeastern Ontario during the afternoon on Sunday. These storms will be mainly non-severe, but some localized flooding could be an issue especially to the northeast of the GTA. They’ll be moving very slowly and could ‘train’ over an area for several hours bringing between 50-100mm of rain. Small hail and strong wind gusts are also possible. The storm risk will come to an end by the late evening.