A summer storm could be on the horizon for parts of the Greater Toronto Area on Monday.
A severe thunderstorm watch is in effect for North Bay, Powassan, Mattawa and West Nipissing.
Severe thunderstorm watches are issued when conditions could allow the development of thunderstorms that can produce large hail, damaging winds or torrential rainfall, the EC website said.
The risk of severe thunderstorms is associated with a cold front moving from west to east over northeastern Ontario today. Strong wind gusts can toss loose objects, damage weak buildings, break branches off trees and overturn large vehicles.
Heat warnings have also been issued for other areas of the province, from northern areas surrounding Spruce Grove, Fort Saskatchewan and Bonnyville through to the southern edge of the province surrounding Lethbridge and Cypress Hills Provincial Park.
Overnight temperatures of at least 14 C are also expected.
Drink plenty of water even before you feel thirsty and stay in a cool place.
Wednesday will see a high of 25 C and a high of 27 C is in the forecast for Thursday and Friday.