Millions of Canadians are under yellow or orange-level heat warnings as temperatures soar into the mid-30s Celsius, marking southern Ontario's first heat wave of the summer. According to meteorologist John Vennavally-Rao, the greatest danger from this extreme weather event is not the intensity of the heat but its prolonged duration.
Prolonged heat poses health risks
“It's the duration that's the real concern,” Vennavally-Rao said. “When you have several consecutive days of high heat and humidity, the body doesn't get a chance to recover overnight, increasing the risk of heat-related illnesses.” The heat wave is expected to last multiple days, with little relief expected during nighttime hours. Cooling centres have opened across the region to provide respite for vulnerable populations.
Precautions and advisories
Health officials advise residents to stay hydrated, limit outdoor activities during peak heat hours, and check on elderly neighbours and those with chronic conditions. The yellow and orange warnings indicate moderate to high risk, with potential impacts on public health and infrastructure. “We urge everyone to take this seriously,” added Vennavally-Rao.
