Southern Ontario: Thunderstorm Outlook for Monday, June 14, 2021

Forecast Discussion

An area of rain with embedded non-severe thunderstorms is expected to affect areas around Georgian Bay, Lake Huron and into the GTA during the morning hours on Monday. The main concern with these storms is heavy rainfall with a few pockets picking up rainfall totals between 20-40mm by the afternoon. A more robust risk of thunderstorms will develop later in the day through the late afternoon and into the evening with all of Southern Ontario at the risk of seeing a thunderstorm. There are some indications that a few stronger storms could develop in Eastern Ontario that may reach severe levels with large hail, damaging wind gusts and heavy rainfall. The tornado risk with these storms isn’t particularly strong, but as usual, can’t be fully ruled out. The severe risk will come to an end by midnight although scattered showers and isolated non-severe thunderstorm continue through the overnight in Eastern Ontario