The normally cooler temperatures in the northwest of the Canadian province of Ontario have given way to a heart warning, Environment Canada forecast Monday.

The warning, the first time it has been issued in 2022, covers most of the week as forecasts say the thermometer could reach 90 Fahrenheit (32 Celsius) in the northern area of the city of Thunder Bay and the southwest in the area of the city of Windsor. When the humidity is factored in, it will feel like 104 Fahrenheit (40 Celsius).

Environment Canada said the high temperatures would likely result in a deterioration of air quality. The agency suggested people do health checks on senior family members, as well as older friends and neighbors.

"Extreme heat affects everyone," Environment Canada said in a statement issued Monday. "The risks are great for young children, pregnant women, older adults, people with chronic illnesses and people working or exercising outdoors".

The agency said those who work outdoors should make sure they drink water to keep hydrated and outdoor events should be relegated to the coolest times of the day. Environment Canada also warned that pets should not be left in vehicles, even with the windows down.

The Ontario northwest region has seen wild weather this year with extensive spring storms carrying extreme snowfalls, freezing rain and serious flooding.

In the Windsor area west of Toronto, Environment Canada said there is a possibility of temperatures soaring into the high 90 Fahrenheit tomorrow and Wednesday.

Heat warnings have also been issued for the adjoining province of Manitoba with temperatures forecasted to reach 90 Fahrenheit. Sunday, the province set records for heat as temperatures reached into the mid-90s.

Environment Canada said people should be aware of heat sickness, including fainting, swelling and cramps, and ill-effects on those with certain health conditions./agencies