Storm risk in Ontario precedes a welcome, but short break from the heat

A cold front sweeping into southern Ontario Monday will lead to the nicest stretch of weather we’ve seen all summer.

But, it will also bring the risk of thunderstorms before that happens.

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A system will swing through the region is likely to spark off thunderstorms through Monday evening as it moves into a favourable environment. Some of the storms could reach severe limits with heavy downpours, strong winds and small hail as the possible hazards.

Pay close attention to the radar as you go about your day, and stay alert for potential watches and warnings issued in your area.

Monday brings storm risk before brief reprieve from the heat

As the low-pressure system pushes into the region, there is a heightened risk of thunderstorms across southern Ontario.

Sunday overnight saw light rain sweep through the region with the warm front ahead of the system, but the cold front will be bring its force. The heat and humidity will help to fuel the storms on Monday.

The storms began through the morning, pushing towards the south into the afternoon. They could bring strong winds, heavy rain and large hail, nickel-sized or greater.

However, the timing of the storms is dependent on how slow the cold front moves south, with some models showing early afternoon and others in the late-afternoon period.

The ridge that cranked up the heat will be replaced with a broad trough that’s located over Hudson Bay. As the trough digs south, a cooler patterns moves in with comfortable and more seasonal conditions across southern Ontario.

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Daytime temperatures in the low- to mid-20s with decreased humidity will make for downright pleasant conditions. Make plans to get out and enjoy it while you can.

But that doesn't mean the end of the rain. On Tuesday, another low-pressure system pushes into the region, bringing heavy rain into the region. However, a clear stretch will take over from that point onwards.

Overnight lows will be down to the mid-teens, right around where they should be this time of year.

Even cooler and more comfortable temperatures are expected away from urban areas and north toward cottage country and into northern Ontario. Add in the lower humidity and it’ll almost feel chilly in spots.

Don’t get used to the cooldown. It’s still summer, after all, and forecasters expect a return to muggy weather for the latter half of the month.

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