Environment Canada has issued a rainfall warning for Toronto and the GTA.

The agency says as much as 30 to 50 mm of rain are expected across southern Ontario starting Wednesday night and throughout Thursday.

680 NEWS meteorologist Jill Taylor said Toronto and the GTA can expect wind and anywhere from 15 to 25 millimetres of rain on Thursday. There’s a high of 7 C in the forecast, dropping to -1 C Thursday evening.

Snow is possible for areas northwest of the GTA from Thursday night into Friday morning, Taylor said.

“The ground, already near saturation, has little ability to absorb further rainfall,” Environment Canada said. “Localized flooding in low-lying areas is possible.”

The Toronto and Region Conservation Authority says with the amount of rain expected, streams and rivers will rise to higher than normal water levels and that rapidly rising or fast moving water can create dangerous conditions.

The rain, which will be heavy at times, is expected to change to snow late Thursday.