It could feel like 44 C as heat warning starts in southern Ontario

Another heat warning has been issued for southern Ontario.

The warning comes during a hot summer in the province with heat events in July and June.

The latest warning starts on Thursday and is expected to continue into the weekend in Toronto, Mississauga, Brampton, Halton Region, Hamilton and through to Niagara Region, according to Environment and Climate Change Canada.

The hottest day is expected to be on Thursday, with daytime high temperatures up to 35 C with peak humidex values up to 44 C. Nighttime low temperatures of 20 to 23 C are expected.

On Friday, the daytime high could reach 30 C with peak humidex values near 40 C. Nighttime low temperatures will be near 21 C.

The heat event could continue through the weekend for some areas.

While daytime high temperatures will not be as extreme on Friday and into the weekend, nighttime lows are expected to remain warm throughout, the warning states.

Extreme heat can affect everyone’s health. Stay alert to heat illness and check on older adults, those living alone and other at-risk people in-person or on the phone multiple times a day, the warning advises.

Early signs of heat exhaustion may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop activity and drink water.

Heat stroke is a medical emergency and people should call 911 if they, or someone around them, is showing signs of heat stroke, which can include red and hot skin, dizziness, nausea, confusion and change in consciousness.

While waiting for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, and applying cold water or ice packs around the body.

Drink water often and before you feel thirsty to replace fluids. Close blinds, or shades and open windows if outside is cooler than inside. Turn on air conditioning, use a fan, or move to a cooler area. If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park.

Never leave people, especially children, or pets inside a parked vehicle. Check the vehicle before locking to make sure no one is left behind.

Areas shaded in red are under a heat warning on Thursday and Friday.

Lead photo: Andrea Piacquadio