Saturday saw tornado-warned storms move through parts of northern Ontario, but for Sunday, the severe weather threat will be at the opposite end of the province. The storm potential will be confined to the western GTA and areas southward, with the chance of some reaching severe limits in the southwest. Temperatures will be above seasonal once again, with a lingering humid air mass in southwestern areas Sunday that will make it feel closer to the 30-degree mark or higher for some. Beyond, a tricky forecast is in play for the first half of this week. For more, read below.
SUNDAY: MULTIPLE ROUNDS OF STORMS POSSIBLE, SEVERE RISK IN SOUTHWEST
On Sunday, it will be the most southern areas of Ontario that will need to pay attention to skies for thunderstorm potential, thanks to a sluggish boundary drifting across the region.
There is likely to be multiple rounds of thunderstorms in parts of the region, beginning in the early afternoon and continuing through the evening. With moderate cape values, the severe threat is present in the southwestern sections, aided by a warm southerly flow.
Areas stretching from Grand Bend to just shy of Port Colborne, southward to just past Chatham, will see the potential for storms to reach severe criteria. Hazards with the more potent cells will be strong wind gusts, large hail and heavy rain.
Temperature-wise, Sunday won’t be far removed from Saturday, with similar mid-20s for daytime high in the south. However, the extreme southwest will be a bit warmer, with temperatures expected to hit or exceed the 30-degree mark in Windsor. The air mass will be a bit humid, as well, with feels-like values approaching or above 30 in several areas.
LOOK AHEAD: STORM RISK, FORECAST GETS TRICKY FOR FIRST HALF OF NEXT WEEK
Beyond the weekend, a tricky forecast for the first half of next week. Very warm and humid air attempts to push north into the region, but it is uncertain how far north the boundary will get before a cool front sweeps across the region.
A couple rounds of showers and thunderstorms are expected with the two fronts. More sunshine and less active weather for the second half of the week and into weekend with a warming trend.
Warmer than normal temperatures are expected to dominate for mid- and late-September with the potential for a few days of very warm and possibly hot weather.
Thumbnail courtesy of Mally, taken in Vaughan, Ont.
Check back as we continue to monitor Ontario's forecast