A prolonged period of extreme heat and humidity is forecast to continue across much of Eastern Canada, extending into the upcoming week. Environment Canada has issued heat warnings for regions stretching from Ontario to Newfoundland, including major metropolitan areas like Toronto, montreal, and Halifax.

Temperatures are forecast to consistently reach the mid-to-upper 30s Celsius (95-104°F),with the humidex – a measure combining temperature and humidity – making it feel closer to 40°C (104°F) or even 42°C (108°F) in some locations. The high humidity will prevent nighttime temperatures from dropping substantially,offering little respite from the heat. Specifically,Ottawa‘s Rideau Valley Conservation authority has issued a Heat Alert,warning of potential impacts on human health.

The combination of high temperatures and dry conditions is also significantly increasing the risk of wildfires. The Ontario Ministry of Natural Resources and Forestry currently lists a fire danger rating of “high” to “extreme” for much of the province’s eastern regions, particularly north of algonquin Provincial Park. Fire bans are in effect for several municipalities, including Bancroft and North Bay.

Heat stress can affect anyone, but certain groups are particularly vulnerable, including seniors, young children, individuals with chronic illnesses, and those working outdoors. Symptoms of heat exhaustion include dizziness, headache, nausea, and heavy sweating. Heatstroke, a more severe condition, can be life-threatening and requires immediate medical attention.Dr. Theresa Tam, Canada’s Chief Public Health Officer, urges residents to stay hydrated, seek shade, and check on vulnerable neighbours.

Understanding the Long-Term Trend: While heatwaves are a natural part of summer, climate change is increasing their frequency, intensity, and duration. According to a recent report by the Intergovernmental Panel on Climate Change (IPCC), Canada is warming at roughly twice the global average rate, making extreme heat events more common. The report highlights the need for increased preparedness and mitigation efforts to protect public health and infrastructure.

the current heatwave is being driven by a strong ridge of high pressure anchored over Eastern Canada. This pattern is expected to persist for at least the next five days, with little chance of important relief. Meteorologists at The Weather Network predict that several cities, including Montreal and Quebec City, could experience their longest heatwave in over a decade.