Environment Canada has issued a severe thunderstorm watch for Hamilton Monday afternoon, as some of the city's neighbours in southern Ontario are under a severe thunderstorm warning.
“Warm and humid air is creating favourable conditions for the development of dangerous thunderstorms that may be capable of producing strong wind gusts, large hail and torrential rain,” the federal agency said in a statement.
It is possible to see rainfall of 50 to 75 millimetres, as well as large hail of 2 centimetres and brief wind gusts of 90 kilometres per hour, the agency said.
"Fast moving water across a road can sweep a vehicle away. Large hail can damage property and cause injury. Strong wind gusts can toss loose objects, damage weak buildings, break branches off trees and overturn large vehicles," it said.
Residents are recommended to take cover immediately if threatening weather approaches and stay away from all windows, skylights and doors.