Wednesday, July 14th 2021, 8:50 pm - Severe storm risk builds back into Ontario Thursday, with a chance of a tornado not being ruled out.
Forecasters are keeping a watchful eye on Thursday's storm potential, which has a high chance of reaching severe levels for parts of the southwest somewhat inland of Lake Huron – with a tornado not being ruled out for some areas. The trigger will be a cold front passing through the province that will fuel some unsettled conditions heading into the weekend. More on the upcoming storm threat and beyond, below.
THURSDAY: A COLD FRONT BRINGS A CHANCE FOR SEVERE STORMS
A low-pressure system will move across the Great Lakes into northern Ontario during the day on Thursday. As the low pushes north, a cold front will sag into southern Ontario.
As it slices through the dense humidity gripping much of the province, it will bring the potential for strong to severe thunderstorms across the region.
Timing is key when it comes to Thursday’s storms. The severe weather threat will be maximized where the cold front’s passage coincides with the greatest instability during the afternoon hours, with storm potential lasting into the early evening.
The strongest thunderstorms on Thursday could pose a risk for heavy rainfall, strong wind gusts, and large hail. For the area of greatest risk, ranging somewhat inland from Lake Huron and Georgian Bay, forecasters say there is a slight risk of one or two tornadoes.
Thursday will also be the warmest day in what has already been a scorcher of a week, with an afternoon high in Toronto coming in around 30°C with humidity pushing the feels-like into the mid-30s.
FRIDAY AND BEYOND: A COLD FRONT TO END THE WEEK, SUMMER REASSERTS ITSELF SOON ENOUGH
The cold front responsible for Thursday’s storms will take its time moving through the area. The boundary will lead to showers and thunderstorms on Friday and Saturday.
Temperatures will feel noticeably cooler both days compared to Thursday, though readings will still come in around seasonal.
Conditions should calm down once the boundary moves away later this weekend. Near- to above-seasonal temperatures, sticky humidity levels, and an occasional chance for passing showers and thunderstorms will make next week look and feel like the middle of July.
Stay with The Weather Network for the latest on the storm threat across southern Ontario.