Weather forecasters are advising GTA residents to pack their umbrellas as a weather system brings warm, moist air in from the Gulf of Mexico.
Environment Canada said in a special weather statement Tuesday morning that the Golden Horseshoe could expect up to 40 millimetres of rain, with a high of 12 degrees Celsius.
CTV Toronto weather anchor Anwar Knight said the context is that people should expect that much precipitation to fall over the next 24 hours. However, the rain will be heavy at time, he said.
The statement covers an area that starts at Windsor, arcs north up to Algonquin Park, and then down to Ottawa.
Parts of Lake Huron and Georgian Bay can expect 15 to 25 mm of rain as the system moves through.
The worst weather will actually strike east of the GTA. Eastern Ontario, which is under a rainfall warning, could see more than 50 mm of rain.
"A cold front from the low pressure system will act as the back edge of the rain and push it out as it moves into southwestern Ontario by this evening," Environment Canada wrote.
“The front will move east reaching the greater Toronto area tonight with the rain expected to ease off in its wake by Wednesday morning," the weather agency said.
"Rain will persist much of Wednesday over Eastern Ontario before turning over to a period of wet snow in the wake of the front."
Wednesday's daytime high in Toronto is only expected to be 2C.
