Warmth to return to southern Ontario, but there will be a rainy catch

While Wednesday will bring a chill back to the southern Ontario, you won’t have to wait long for temperatures to rebound again. However, the warmth will come with rain and a thunderstorm threat rather than sunshine.

A powerful Colorado low will have a major impact across central and eastern North America, beginning late this week and continuing on the weekend. The strong storm will develop Thursday night and Friday, and is expected to track from the central U.S. across to the Upper Midwest to Lake Superior. That storm is expected to create a wintry mess for parts of Manitoba and northwestern Ontario.

DON'T MISS: A reminder of March’s cold side as temperature plunge moves east

For southern Ontario, the active weather will return on Saturday. A secondary low will develop in the Deep South and track northeast along the cold front, bringing a surge of mild air, and plenty of rain and a thunderstorm risk, with it.

This weekend: Mild air brings rain and thunderstorm risk with it

A large Colorado low will track into extreme northwestern Ontario by Friday evening.

Combined with the influence of a strong centre of high pressure over the Atlantic Ocean, a sharp southerly flow will develop for a big chunk of Ontario.

For southern areas, it will help kick off warm and rainy conditions on Saturday afternoon. A second low will swiftly follow, potentially stirring up more active weather on Sunday

Southern Ontario will be under an expansive warm sector, raising temperatures into the teens, so precipitation will fall as rain. Heavy amounts are anticipated, too, along with the chance of embedded thunderstorms.

Abundant moisture will be scooped up from the Gulf of Mexico, leading to localized flood threats as 20-30+ mm of rain is possible.

However, there will be uncertainty as to where the heaviest rain axis will line up as the storm track continues to shift.There is also uncertainty of how severe the thunderstorms could be at this time.

This weekend will feel more like May rather than March across southern Ontario. Above-seasonal temperatures are likely from Windsor to Moosonee, stretching all across eastern Ontario, as well. We will likely see Canada’s first 20°C of the year on the weekend, if not, before then.

Another Colorado low is expected next week, but this storm is not expected to be nearly as strong as the impending system. However, it should also have more cold air to work with and bring snow to parts of Eastern Canada.

Stay with The Weather Network for your latest forecast across Ontario.

WATCH: The GTA just saw its windiest winter in 15 years

Click here to view the video