Heatwave Affects Large Areas of US and Canada
Extensive regions across the United States and Canada are currently experiencing another heatwave, resulting in extreme temperatures and degraded air quality.
Toronto along with other Canadian cities, as well as parts of the US Midwest and Northeast, are continuing to endure high temperatures that began on Tuesday and are expected to persist into Wednesday. Meanwhile, millions of Americans in western parts of the US have already been coping with intense heat.
Advisories remain in effect for millions of residents in cities including Boston, New York City, Philadelphia, and extending westward to Buffalo, New York, through Wednesday.
This surge in temperatures follows closely after a record-breaking heatwave over the Fourth of July holiday, which impacted large portions of the US and prompted experts to advise caution.
Atmospheric Conditions Driving the Heat
A robust high-pressure system in the upper atmosphere is advancing eastward across the US and parts of Canada. This dome of hot and humid air has already caused all-time temperature records to be surpassed in regions of Montana and Utah. The heat is now shifting eastward.
The northern Plains, Midwest, and Northeast regions are expected to experience the most intense heat, with Chicago forecasted to reach 97°F (36°C) on Wednesday.
Simultaneously, New York City could see temperatures climb to 100°F, while Washington DC is anticipating highs of 102°F. Some locations may experience even higher temperatures, with elevated humidity levels contributing to increased discomfort.
Central and eastern Canada have also been affected by elevated temperatures; however, a cold front is anticipated to lower temperatures over the coming days. This front may also bring severe thunderstorms, potentially impacting parts of New England.
By the weekend, thunderstorm activity is expected to become more widespread across eastern North America, which should alleviate the most severe heat conditions. Nevertheless, temperatures in many areas are projected to remain above average for the season.
Impact of Recent Heatwaves
Earlier in July, extreme heat disrupted Fourth of July celebrations in various US locations, including the cancellation of the Washington DC parade.
During the period from July 1 to July 4, over 165 million people along the US East Coast and Midwest endured record-breaking temperatures. At least 44 fatalities in the US have been attributed to this heatwave.
Climate Change and Heatwave Frequency
Heatwaves have become increasingly frequent, intense, and prolonged due to human-induced climate change. Global temperatures have already risen approximately 1.1°C since the start of the industrial era, and are expected to continue increasing unless governments worldwide implement significant emissions reductions.
More than 2,700 people may have died in exceptional May and June heatwaves in England and Wales.
Brutal heat caused cancellations of Fourth of July events, from Washington DC to Philadelphia.
