Environment Canada has issued widespread weather alerts across five provinces and one territory due to extreme heat, thunderstorms, and tornado risks.Temperatures are expected to reach mid- to high-30s Celsius in southern Ontario, with humidity making it feel like the mid-40s.

Heat warnings cover all regions except northern Ontario's most remote areas, while Quebec and New Brunswick face hazardous storm conditions, including an orange tornado watch between Montreal and Quebec City.A massive high-pressure system over the U.S.is driving these extreme conditions, with Ottawa projected to hit 35°C—the hottest day of 2026 so far.Cities like Toronto could set new heat records, though northern Ontario has lower thresholds for heat warnings due to historic norms.

Cooling stations and pool access have been expanded nationwide, while businesses like the Heart and Soul Café in Ottawa are temporarily closing to protect staff.Health advisories warn of heat exhaustion symptoms, emphasizing the need for air conditioning, hydration, and avoiding sun exposure.Wildfire smoke from northern Quebec is also affecting air quality, creating a 'double whammy' of heat and poor air quality in some regions.Environment Canada urges residents to monitor local conditions and take precautions during this extreme weather event.