Update: The severe thunderstorm warning has now ended
A severe thunderstorm warning is in effect for St. Catharines, Grimsby, and the Northern Niagara area.
Meteorologists are tracking a storm capable of producing powerful wind gusts, hail, and heavy rain.
As the storm rolls into the Niagara region there are reports of 25 to 50 mm of rain and 2 cm of hail.