Strong to severe thunderstorms rocked portions of southern Ontario on Saturday afternoon as heat and humidity built back over the region. The warm front responsible for the return to mugginess will spread into northern Ontario on Sunday, leading to a widespread risk for severe storms during the day. More on Sunday’s storm threat and just how long the sticky air will last, below.
SUNDAY: WIDESPREAD SEVERE STORM RISK ACROSS ONTARIO
Saturday saw plenty of storms bubble across southern Ontario, with picturesque storms spotted far and wide.
We could see another risk for severe storms on Sunday as the soupy air stretches even deeper into the province.
A low-pressure system at the surface will exit the Great Lakes and slide into northeastern Ontario. Meanwhile, the warm front stretching off the low will push far into northeastern Ontario by Sunday, allowing for warm and humid air to blanket most of the eastern half of the province.
The setup will bring a far-reaching chance for severe thunderstorms across much of Ontario and parts of southern Quebec in the afternoon on Sunday. The greatest threat for organized severe weather will occur near the centre of the low, including in Timmins and the surrounding areas.
Any of the storms that form on Sunday that reach severe limits could produce strong wind gusts, heavy rainfall, and large hail. As we saw on Saturday, watch out for the potential for localized flooding issues in some of the heavier storms.
Temperatures Sunday will be similar to Saturday, with daytime highs hovering close to the 30-degree mark in much of the south, even hitting the low 30s in the southwestern region.
The feels-like values will be into the upper 30s and at or above 40 in parts of the aforementioned areas. Eastern Ontario will warm up considerably, reaching temperatures in the same range of its southern counterparts.
THE WEEK AHEAD: STILL WARM, BUT HUMIDITY TAKES A BREAK
A cold front will follow behind that low-pressure system, allowing drier air to filter over much of Ontario to start the week. Monday will still be very warm, but the humidity will decrease through the day.
Cooler, near-seasonal temperatures and less humidity for most of next week. Daytime highs will come close to seasonal in the Greater Toronto Area, and it won’t feel too bad with the humidity sitting at a more tolerable level.
We could see warmer weather for the start of the long weekend, but the details are a bit uncertain this far out.
Stay tuned for the latest on this weekend's storm threat across Ontario.