Southern Ontario: Thunderstorm Outlook for Friday, June 25, 2021

Forecast Discussion

A strong system expected to bring very heavy rainfall to regions east of Lake Huron and around Georgian Bay could also have a few embedded non-severe thunderstorms throughout the day on Friday. These thunderstorms won’t be particularly strong except for some lightning and maybe stronger wind gusts. But some locations east of Georgian Bay could see these storms ‘train’ over the area for several hours with significant rainfall totals up to 50mm. Flash flooding will be a huge concern - a separate forecast for the rainfall will be issued closer to the event with the rain continuing into the weekend.