Severe thunderstorm watches have ended for Toronto and the GTA, Environment Canada says.

The federal forecaster said a storm system approached the regions from the northwest and was capable of producing severe thunderstorms with large hail, damaging winds or heavy rainfall. The watches were also affect Hamilton, Pickering, Oshawa and Southern Durham Region.

Watches remain in effect for parts of southern Ontario including the Niagara and Windsor regions.

As of 1:30 p.m. on Monday, heavy rains were pounding downtown Toronto.

“Rainfall amounts of 50 mm in an hour will be possible in some of these storms,” the federal weather agency said in the alert.

Environment Canada advised the public to monitor weather conditions and listen for updated bulletins.