Southern Ontario: Thunderstorm Outlook for Sunday, June 27, 2021

Forecast Discussion

Non-severe thunderstorms from Saturday evening are expected to continue to affect regions east of Georgian Bay throughout the morning hours on Sunday bringing the threat of flooding since many locations have already seen significant rainfall over the past 24 hours. These storms will move out of the province by late morning.

Another round of storms will develop later in the day during the afternoon as isolated pop-up storms show up through Southwestern Ontario and up into areas around Georgian Bay. A few of these storms could have the potential to reach severe levels with strong wind gusts, large hail and of course very heavy downpours.

Like we saw on Saturday, there could be the risk for one or two tornadoes, but it’s not as strong as the setup on Saturday that produced the Chatsworth tornado. The tornado threat extends from Georgian Bay and east through Central Ontario including Simcoe County, Muskoka, Haliburton and Bancroft. These storms will track to the northeast towards Central and Eastern Ontario along with parts of the Ottawa Valley. The storms should clear out by midnight as they quickly weaken and fizzle out.