Vast regions of the United States and Canada are currently enduring another intense heatwave, characterised by extreme temperatures and deteriorating air quality. This latest period of severe weather follows closely on the heels of a record-breaking heatwave earlier in July that caused widespread disruption and tragically led to at least 44 fatalities across the US.
The current conditions, which began earlier this week, are expected to persist for several days, particularly impacting Toronto and other Canadian cities, as well as the US Midwest and Northeast. Millions of residents are under heat advisories stretching from Boston and New York City to Philadelphia and as far west as Buffalo, New York. A powerful area of high pressure, creating a dome of hot and humid air, is progressively building eastwards across North America, having already set new temperature records in parts of Montana and Utah.
Forecasts indicate particularly oppressive conditions for the northern Plains, Midwest, and Northeast. Chicago is anticipated to reach approximately 36°C, while New York could see temperatures climb to 38°C. Washington D.C. is bracing for a sweltering 39°C, with some localised areas potentially experiencing even higher readings. The combination of high temperatures and significant humidity is expected to make the conditions feel considerably more uncomfortable for residents.
While central and eastern areas of Canada have also experienced high temperatures, a cold front is predicted to bring some relief in the coming days, alongside the threat of severe thunderstorms. These thundery conditions are expected to spread across eastern North America by the weekend, pushing away the most extreme heat, though temperatures in many areas are still likely to remain above seasonal norms.
The earlier heatwave, which coincided with Fourth of July celebrations, forced the cancellation of events, including the Washington D.C. parade. More than 165 million people across the US East Coast and Midwest were affected by record-breaking temperatures during that period. Scientists and meteorological experts continue to highlight that heatwaves are becoming more frequent, more intense, and longer-lasting due to human-induced climate change. The global average temperature has already risen by approximately 1.1°C since the industrial era, and further increases are anticipated unless there are substantial global reductions in emissions.