Southern Ontario: Thunderstorm Outlook for Tuesday, June 8, 2021

Forecast Discussion

Widespread scattered thunderstorms are expected to affect Southern Ontario starting with a round of storms early in the morning for Southwestern Ontario and into the Golden Horseshoe. Another round will develop later in the day throughout the region bringing the potential for mostly non-severe wind, hail and rainfall. There is also some questionable severe risk mainly through Northeastern and Eastern Ontario where high instability exists (shown in the ‘questionable severe risk’ zone), but storm development appears to happen further south where the environment is less favourable. At this point, we’re sticking with a non-severe risk but some areas may need to be upgraded to an isolated severe risk if storm development in the area with the stronger environment is looking more likely.