Heavy rainfall expected in northern parts of the GTA

Muggy weather grips Toronto as heat warning, severe thunderstorm watch continues for city

Umbrellas are a must-have accessory if you're heading out tonight. 

A special weather statement has been issued by Environment Canada for much of the GTA. A line of heavy showers are expected to fall across northern Toronto and move west towards the Brampton area. Toronto, Vaughan, Richmond Hill, Markham, Mississauga, Brampton are all under alert. 

20 to 40 mm of showers are expected by 7 p.m. Prepare for reduced visibility during peak showers.