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Wednesday: The storm threat could be Ontario’s last of the season, including the possibility of a tornado
Midsummer-like blustery conditions will linger across much of southern Ontario for another day Wednesday, with highs in the mid-20s and humidex readings breaking into the 30s. However, there will be a price for warmth. Thunderstorms will develop by midday ahead of the cold front. These storms will likely merge into a squall line, producing widespread strong wind gusts as they move across southern Ontario by Wednesday afternoon. But there are some areas of uncertainty about growth. Morning thunderstorms in southwestern Ontario will determine the amount of storm energy in the area through the afternoon. The faster storms move away, the more energy can build up and the greater the chance of developing storms on the Canadian side of the border. The other potential obstacle is the warm front lingering over the Ottawa Valley, potentially limiting the northeasterly development of strong storms along the cold front (North Gulf to Ottawa). At this time, the highest confidence for strong to severe thunderstorms is from the Kawartha Lakes to Kitchener-Waterloo, including the Greater Toronto and Hamilton Area (GTHA). Storms will move quickly, reducing the risk of flooding. The subtropical air mass will prevent large hail from forming. However, damaging straight-line winds and embedded tornadoes will be the primary threats. We will continue to closely monitor atmospheric dynamics for Wednesday. RELATED: Why You Can’t Rule Out Tornadoes During Ontario’s Coolest Months Beyond Wednesday, the swing of the trough over the eastern half of the country will bring dramatic changes on Thursday. Toronto will see a high near 30 Wednesday afternoon, but daytime highs are expected to reach the upper teens by Thursday afternoon. This will be the coolest track across the region from the May weekend.
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Check back for the latest conditions across Ontario.
