Southern Ontario: Thunderstorm Outlook for Tuesday, September 14, 2021

Forecast Discussion

What appears to be a regular occurrence in Southern Ontario on Tuesdays, we’re expecting the potential for very strong storms during the afternoon and evening. This will begin with a line of storms stretching from Lake Huron across Georgian Bay and into Central Ontario during the mid to late afternoon. The line will slowly progress to the southeast during the remainder of the afternoon and into the evening reaching the GTA by the early evening and Eastern Ontario later in the evening. We can expect these storms to bring the threat of large hail, damaging wind gusts, frequent lightning and heavy rainfall. There is also a fairly strong chance of tornadoes with this setup. As shown on the map, we believe the area with the strongest threat from these storms includes regions east of Lake Huron and Georgian Bay with the severe threat diminishing later in the day as the storms track to the east.