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Heat dome: Toronto weather could feel like 41 degrees on Monday

Heat dome: Toronto weather could feel like 41 degrees on Monday
Heat dome: Toronto weather could feel like 41 degrees on Monday

It could feel like 41 degrees in the Toronto area on Monday, and a senior climatologist with Environment Canada warns that conditions are likely to become even more unbearable later this week due to a weather phenomenon known as a “heat dome.”

Dave Phillips made this statement on CP24 when he spoke about a heatwave with temperatures potentially exceeding 30 degrees Celsius over the next four days.

The high temperatures will also be accompanied by significant humidex values, which will make it feel like 40 or 41 in the GTA through Thursday. Residents will get a little relief on Friday, but barely. It will still reach a daytime high of 27 C and feel like 35 with the humidity.

“We’re under the dome, the thermal dome, and it’s like putting the Rogers Centre over a large portion of North America, from Atlanta, Georgia to Atlantic Canada, and the air doesn’t circulate, it just stays there,” Phillips warned. “What’s actually happening under the dome is the air is just being forced down and all those little air molecules are vibrating and creating more heat and the heat has nowhere to go. It stays put and gets hotter the closer you get to the surface.”


  • For a closer look at the sultry conditions and the latest CP24 forecast, click this link.

Environment and Climate Change Canada issued a heat warning on Sunday that remains in effect for all of southern and central Ontario and parts of northern Ontario.

The agency warned that daytime temperatures will be between 30 and 35 degrees for most of the week, with lows of 20 to 23 degrees at night. Due to humidity, temperatures may still feel between 26 and 30 degrees.

Speaking to CP24, Phillips said conditions at night are particularly worrying as they mean there is effectively “no escape” for vulnerable residents from the stifling conditions.

He also warned that conditions are likely to become more difficult as the week progresses due to the heat dome phenomenon, which prevents warm air from escaping.

“The heat bubble is always worse at the end than at the beginning. At the beginning, the body is quite resilient. We can do one day, even people with health problems. But towards the end, the body is exhausted. You can’t do it morning, noon and night, and then you add humidity and pollution to that. You can’t breathe.”

City opens some pools earlier and extends hours

In preparation for the heat wave, the City of Toronto has announced plans to open 10 outdoor swimming pools and 10 kiddie pools ahead of schedule.

The city has also announced that the opening hours of its ten swimming pools will be extended.

From Monday through Thursday, the Heron Park Community Centre, Kiwanis Outdoor Pool, Pine Point Park Outdoor Pool, Riverdale Park East and West Mall Outdoor Pool are open until 9pm, weather permitting.

Alex Duff Memorial Pool, McGregor Park, North Toronto Memorial Community Centre, Parkway Forest Outdoor Pool and Sunnyside Gus Ryder Outdoor Pool are open until 10pm on Monday evenings, weather permitting.

From Tuesday through Thursday, these locations will be open until 11:45 p.m., weather permitting, the city said.

All other pools in the city of Toronto are expected to open for the season on June 28.

The water playgrounds are also open for the season and are open daily from 9am to 9pm.

Libraries and community centers are also places where people can take shelter from the heat.

In the alert, Environment Canada warned that extreme heat poses a health risk, especially to the elderly, infants, young children, pregnant women, people with physical or mental illnesses, and people with mobility impairments.

People are advised to limit or avoid heavy physical exertion outdoors as much as possible and to drink plenty of fluids.

People are also reminded not to leave anyone, especially children and pets, in a park vehicle.

“Children have a large surface area for their size, so they can lose a lot of fluid and electrolytes when they’re active and even just hanging out in a warm classroom environment. They also may not sweat as much as older people, and sweating helps us regulate our body temperature,” Dr. Dina Kulik, pediatrician and founder of Kidcrew Medical, told CP24 Monday afternoon. “So we always want to make sure that your kids are drinking a lot, even if they’re not saying they’re thirsty. Force your kids to drink, even if they’re not asking for it.”

Kulik said there is always an increase in the number of children visiting emergency rooms with heat-related illnesses during heat waves. She said the best way to keep children safe is to “stay in touch” with them and make sure they get fluids and breaks from the sun.

“Are they not as interactive with your bass as before? Are they confused? Do they have headaches or dizziness?” she said.

The scorching temperatures of 30+ are expected to continue through Friday, with highs expected to return to the mid-20s over the weekend.

Due to the warm and humid conditions, there is also a chance of thunderstorms.