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Environment Canada issues severe thunderstorm watch for London-Middlesex

A special weather statement is in effect for London and Middlesex. Daniel Berehulak/Getty Images

A rainy day is on tap for London-Middlesex.

Environment Canada issued a special weather statement for much of southern Ontario early Tuesday morning, but by late morning the national weather agency had replaced those statements with rainfall warnings and severe thunderstorm watches.

The rainfall warnings are in place for areas from Algonquin to Huron-Perth.

Severe thunderstorm watches have been issued for areas stretching from Windsor – Essex – Chatham-Kent to Brockville – Leeds and Grenville, including London-Middlesex.

Officials said early Tuesday that many areas will receive between 20 to 40 mm of rain by the evening. However, areas that get several thunderstorms may receive significantly higher amounts and late Tuesday morning the weather agency said conditions are favourable for storms to develop in London-Middlesex.

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“In the Sarnia area, a thunderstorm rolled through that gave 50 mm in just over one hour,” Environment Canada senior meteorologist Mark Schuster told 980 CFPL early Tuesday morning.

Click to play video: 'Parts of Ontario pounded by hail during freak summer storm'
Parts of Ontario pounded by hail during freak summer storm

While there will likely be periods where the rain clears, Schuster says you shouldn’t let your guard down.

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“More is developing to the southwest and that’s going to advance into the area as well. It looks like there’s going to be on and off showers that could fall torrentially at times, actually, right through into the early afternoon,” he explained.

“Anybody who’s going to be travelling today, just be mindful that there could be some very heavy rainfall. There could be ponding on the roads and very poor visibility in those showers. Make sure you give yourself some extra time and drive according to the conditions.”

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Once the rain clears out, Schuster is forecasting a comfortable string of days with much less humidity and temperatures in the low- to mid-20s.

With files from Nick Westoll of Global News. 

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