Extreme Heat Wave Threatens Over 80 Million Americans as Temperatures Near Triple Digits
The National Weather Service has placed more than 80 million people under heat advisories, with forecasts showing record-breaking temperatures across the South-Central and Southwest United States, a trend scientists link to human-caused climate change.
More than 80 million Americans are currently under an Extreme Heat Warning or Heat Advisory, according to the National Weather Service. Forecasters describe the ongoing heat dome as unusually hot for mid-to-late August, with daytime highs expected to reach the triple-digit range in the South-Central U.S. and the Southwest, and nighttime temperatures remaining elevated.
The Weather Prediction Center projects that the heat wave will persist over the Southern Plains and Lower Mississippi Valley through mid-week, while the desert Southwest could see temperatures of 110 °F or higher by the end of the week. The sustained heat increases the risk of heat-related illnesses, as nights provide little relief.
Scientists attribute the intensifying heat to climate change. Michael Wehner, a senior scientist at Lawrence Berkeley National Laboratory, said that climate change has added roughly 3 to 5 °F to typical U.S. heat waves. Peer-reviewed research, including findings from the National Climate Assessment and the World Weather Attribution network, supports the view that human-caused warming makes extreme heat more frequent and severe.
The National Weather Service’s advisory maps and short-range forecasts are being used by journalists to guide coverage. Experts note that the average number of U.S. heat waves has doubled since the 1980s, and that the current heat index—combining temperature and humidity—could reach 105-115 °F in parts of Arizona, Texas, Louisiana and northern Florida.
Public health officials warn that heat-related deaths are often undercounted and that humid conditions can impede the body’s ability to cool itself. The situation underscores the broader pattern of climate-driven extremes that scientists say would be unlikely without ongoing greenhouse-gas emissions.