Summer wasted no time arriving in Ontario as extreme heat scorched a good portion of the province earlier this week, with peak temperatures hitting the low 30s in some areas, feeling closer to 40 with a stifling humidex. Temperatures will moderate Thursday, but thunderstorm threats will persist across eastern Ontario and southern Quebec. This region has the potential for torrential rainfall with between 40-60 mm possible, and localized amounts up to 100 mm. More on the heat, storm threat, and what lies beyond, below.
THURSDAY: ANOTHER DAY OF HEAVY RAINFALL POTENTIAL WITH STORM THREAT
A narrow axis of moisture will develop across far eastern Ontario and southern Quebec overnight Wednesday into Thursday bringing 50-75 mm of rain to areas including Montreal.
Embedded thunderstorms will be likely within the system that may produce even higher amounts of local rain due it's slow pace across the region.
Residents will need to watch for the chance of some localized flooding to areas that continuously see high rainfall rates due to the stalled system.
In northern Ontario, clusters of storms are expected to be triggered by a cold front across the region. Strong winds and large hail would be the primary threat with these storms.
IT IS HOT IN SOUTHERN ONTARIO, TIPS FOR HEADING OUTSIDE IN THE HEAT
The hottest and most humid air so far this year arrived on Tuesday across much of Ontario, with temperature records broken at Toronto Pearson International Airport and feels-like values that exceeded 40 in many areas.
As for what's remaining of the heat, expect a cool relief come Thursday.
Spectacular late summer-like weather is expected for southern Ontario Thursday and Friday with abundant sunshine, low humidity, and comfortable temperatures. Clouds will linger through Thursday for southern Quebec, but will see increasing sunshine Friday.
A stronger cold front will then track across the region Sunday with showers and thunderstorms followed by cooler weather for the start of next week.
Temperatures are expected to be near seasonal, possibly even a few degrees cooler than seasonal for a couple days, during the final few days of June and through the Canada Day long weekend.
Stay tuned to The Weather Network for the latest forecast updates for Ontario and Quebec.