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Sunday: The heat rises, threatened by a storm in the southwest
The ridge that brought toasty temperatures to the Prairies the past two days will begin to slide east to end the weekend, allowing temperatures to rise across much of Ontario for the day on Sunday. Daytime highs will approach the 30-degree mark for people across cottage and eastern Ontario, with Ottawa and Sudbury on track to reach that mark by Sunday afternoon. Temperatures will remain slightly cooler in southern Ontario as clouds and storms move in from the southwest. An elongated cold front extending from the eastern prairies into northwestern Ontario will continue to produce widespread scattered thunderstorms Sunday in the latter area, where storms could become severe. To the south, the risk for thunderstorms will increase in southwestern Ontario later Sunday afternoon and into the evening as a warm front approaches the region from the state. The best chance for thunderstorms will extend from Windsor to London, with the Huron Coast and Niagara region possibly getting a few thunderstorms by evening. Storms should remain below severe limits, but gusty winds and heavy rainfall are possible.
Monday: Steady rain, thunderstorms for the morning commute
The same disturbance responsible for Sunday’s storm potential in southwestern Ontario will lead to solid precipitation moving across parts of southern Ontario early Monday morning. Rain will spread across the northern shores of Lake Erie before sunrise, pushing into the Niagara Region and Greater Toronto Area (GTA) in time for the Monday morning commute. It will be a steady, much-needed rain for an area that hasn’t seen much rain in recent weeks. Watch out for slick roads as you start the day, and don’t be surprised if a thunderstorm mixes in. Rain will taper off by late morning in the GTA, pushing into eastern Ontario and the National Capital Region by midday. The boundary located in northern Ontario will continue to track east on Monday, bringing the threat of severe thunderstorms in the afternoon for areas stretching from Kenora to Timmins and into central Quebec. There is a chance that storms will reach severe limits in the latter area, extending into southern Quebec, with the possibility of strong winds, light hail and heavy rain with any warning criteria in place. Clouds and rain will help keep temperatures on the cooler side again for the day Monday, with most areas only climbing into the mid-20s by the afternoon peak.
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Next week: Heat and humidity increase in southern Ontario
Heat and humidity will make a triumphant return to southern Ontario by Tuesday. Temperatures will top the 30-degree mark for much of the GTA, with high humidity making things look more like the upper 30s. As we head into Tuesday, a cold front has the potential to change directions and sink into the southern parts of the province. This will bring the risk of more rain and storms, especially across southern Ontario, where some areas have only seen less than a quarter of their monthly normal rainfall. The sweltering heat will continue into Wednesday, with high humidity sending humidex readings into the upper 30s again during the afternoon hours. We can expect warm temperatures to persist through the rest of the week into the weekend. Daytime highs will reach into the 20s, which is above Toronto’s seasonal high of about 25°C for the third week of July. Thumbnail courtesy of Kelly, taken in Stoney Creek, Ont. Stay tuned to The Weather Network for the latest conditions across Ontario.
