Windsor - Quebec Corridor, ON / QC - It is feeling more like May in Ontario and Quebec! Warm southerly flow brought by the warm front, which arrived in the morning hours for much of Ontario, and the noon hours for Eastern Ontario and Quebec, had brought the temperature up to 20s and upper teens! Windsor, hit 21.4 C yesterday, while in the Markham Weather Centre (my personal weather station), we hit a 20.0 C at 15:57 EDT, making it the warmest day so far in the season.

This is all thanks to the warm front, which brought some heavy thundershowers this morning across Southern Ontario (and noon for Eastern Ontario and Quebec). Behind it, a warm gust of southernly air from Texas and the Gulf of Mexico settled in. In the very heart of this airmass (which is in Texas), the local temperature soared up to 40 C!

Well, good things won't last long. A cold front have already swept through the Greater Toronto Area, as well as southwestern Ontario before we knew it. The front settled in these area during noon hours, when the area briefly clouded over, followed by the current sunshine. The winds shifted rapidly from southerly to westerly, and of course, with this, a stronger wind speed is recorded. Temperature will not rise any further for the rest of the daylight hours, and will drop to 3 C (for the GTA), as of tomorrow dawn hours.

After this warm shot of air, we have to deal with wintry conditions. It will be as if we have returned to early March in some cases on Friday. An incoming Colorado Low will stay south of us, but north enough to keep our precipitation as rain. Temperature will dip as low as 2 C (daytime high for Friday across the GTA), and a possible wet flurry or two during the overnight hours. We are expecting the low to linger across the weekend, dumping around 25 to 35 mm of rain throughout the weekend. A misery and cold weekend in store! More details will come later (I have a headache to deal with, and this wet snow business....)

As for the rain/snow line, the rough line will be drawn near the shores of Lake Huron, through Goderich, Wiarton, Owen Sound, Collingwood, Barrie, in through northern Peterborough County, eventually making its way to Renfrew County and Chelsea, Quebec. North of this line can experience primarily a snowfall event, accumulating as much as 10 to 15 cm in parts of northern Muskoka, and Parry Sound. Wow! So much for having temperature in the teens in the area today, then a wintry snow on Friday! Let's face the truth, winter is back! (momentarily, not for long, and of course, more details to come)