Communities in eastern Ontario can expect both a hot day Tuesday with humidity making the temperature feel closer to 40 C.

Environment Canada ended a heat warning Tuesday for several eastern Ontario communities as temperatures reached around 30 C.

Heat warnings are declared when Environment Canada forecasts a humidex of 40 or more for at least two consecutive days.

The national weather agency issued the warnings for the eastern Ontario communities of Prescott-Russell, Cornwall, Maxville, Morrisburg and Winchester, which was influenced by a high-pressure system called a Bermuda high. 

Environment Canada says older adults, infants and young children, the homeless, people with chronic illnesses and people who work and exercise in heat and people without air conditioning are at the greatest risk of heat illnesses.

To avoid heat-related illness, people are advised to:

  • Drink plenty of fluids, preferably water, and to avoid caffeine and alcohol.
  • Avoid strenuous outdoor physical activity.
  • Avoid direct exposure to the sun and seek shade and shelter at the first signs of heat exposure.
  • Wear lightweight and loose clothing.
  • Spend at least two hours a day in an air-conditioned location, including shopping malls, libraries or neighbourhood community centres.
  • Never leave children, the elderly or pets unattended in a car, even with the windows partly rolled down.
  • High air pollution and UV index levels often occur during hot weather conditions.