Thunderstorms build across Ontario, Weather Network Toronto warns of heat
weather network toronto says increasing warmth in southern Ontario will bring the chance for thunderstorms this long weekend, with the threat building toward the end of the holiday stretch. Each day through early next week holds the potential for rain and thunderstorms from northeastern Ontario to the southwestern corner of the province.
Saturday in Timmins and Sudbury
Saturday brings warm temperatures surging into northeastern Ontario as a cold front arrives, and thunderstorms are expected around Timmins and Sudbury. The main hazards there include strong wind gusts and large hail.
A few embedded thunderstorms could also push into southern Ontario as moisture and residual pre-dawn storm activity from Michigan slips through. Most of Ontario is expected to stay rain- and storm-free on Sunday, even as a low-pressure system tracks across the border toward northwestern Ontario late in the day.
Late Sunday Along the Border
Evening or overnight rain and thunderstorms are possible for communities along the Ontario-Minnesota border. Nocturnal thunderstorms are also possible across northeastern Ontario ahead of an approaching warm front, with heavy rainfall the primary threat from larger clusters of storms through early Monday morning.
That leaves two different problems for readers planning around the holiday weekend: a quieter Sunday for much of the province, and a later-day risk that builds again near the border and in the northeast. Lightning can strike dozens of kilometres away from the heart of a storm, and if you can hear thunder, you are close enough to get struck by lightning.
Tuesday Heat and Humidity
High moisture from the Gulf of Mexico and southerly winds will push temperatures into the upper 20s across most of southern Ontario to begin the new week, and some areas could crack the 30-degree mark. Additional thunderstorm activity is forecast Monday afternoon across northern Ontario.
By Tuesday, storm chances spread across central and southern Ontario as the Colorado low’s cold front slices into widespread heat and humidity. Heavy rainfall will be the primary threat, along with small hail and gusty winds, and the storms are forecast to be isolated in nature. The cold front is forecast to move through by early Wednesday morning, bringing non-severe storms and ending the region's heat.
