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Environment Canada is warning high temperatures and high humidity could cause heat stroke this afternoon and a high risk of severe thunderstorms tonight.

The agency is forecasting a high of 30 degrees Celsius, with a humidex value of 40 throughout the day.

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“The risks are greater for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors,” it said in an advisory issued Saturday afternoon. It advises to drink plenty of water and never leave people or pets in parked vehicles to avoid heat illness.

Environment Canada issued a severe thunderstorm watch alert for the following areas.

Châteauguay—La Prairie

Laval

Longueuil— Varennes

Montréal Island

They say the risk of a severe thunderstorm is high in Montreal this evening or overnight.

A thunderstorm’s strong wind gusts can toss loose objects, damage weak buildings, break branches off trees and overturn large vehicles. And in more extreme cases, severe thunderstorms and heavy downpours can even produce tornadoes or flooding.