Southern Ontario is bracing for a fall storm that is expected to bring heavy rains at times and high winds.

Environment Canada has issued a special weather statement and a rainfall warning as a storm system from the U.S. Midwest is expected to merge with remnants of hurricane Patricia before heading towards the Great Lakes region.

Rainfall from the system will start in southwestern Ontario late Tuesday night and move further into the province Wednesday.

Environment Canada says rainfall amounts are uncertain, but most areas can expect anywhere between 25 and 40 millimetres of rain.

London and areas close to Lake Erie and Lake Ontario could see as much as 45 mm to 55 mm of rain between Tuesday night and Wednesday night.

Along with the rain, thunderstorms and strong winds are expected in most areas, with gusts up to 70 km/h, and stronger winds possible along the shores of Lakes Erie and Ontario where gusts may approach 90 km/h.

The City of London is reminding residents and businesses to be prepared and take precautions when travelling during the storm.

There is the possibility of flooded streets and basements, high water levels in creeks and rivers, as well as downed tree branches.

Anyone who experiences storm-related issues is asked to report it to the city at 519-661-4570 during business hours (8:30 a.m. to 4:30 p.m.) or 519-661-4965 during off hours.

For downed hydro lines and power outages, you should avoid the area and call your local utility.