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Widespread Heat Advisories Issued
Millions Affected by Prolonged Heat Dome Over 60 million people in the South and Midwest are currently experiencing the intense effects of a “heat dome.” This weather phenomenon is predicted to linger for several weeks, pushing temperatures to record-breaking levels in cities that have not yet faced triple digits this year.
The National Weather Service has put heat advisories in place across portions of 19 states. Particularly intense heat watches are impacting Wisconsin, Iowa, and Illinois, where residents should prepare for even higher risks in the days ahead.
Escalating Extreme Heat Warnings
Extreme heat warnings—considered even more dangerous—are active in parts of Illinois, Missouri, Arkansas, Tennessee, Louisiana, and Mississippi. These warnings signal a higher threat to health and safety for those in the affected regions.
Major Cities Under Threat
Several major cities are currently under heat alerts, including Dallas, New Orleans, Memphis, Little Rock, St. Louis, Kansas City, Chicago, and Minneapolis. For some, like Dallas and Kansas City, temperatures could reach 100 degrees for the first time this year or in several years.
Heat Index Soars Across the Region
The “feels like” temperature, or heat index, is expected to range between 100 and 110 degrees across the central Plains and Southeast. This oppressive heat is forecasted to stretch to the East Coast by Friday, affecting even more communities.
Meteorological Explanation: The Heat Dome
Meteorologists explain that a “heat dome”—created by a high-pressure buildup of hot, humid air caused by a bulging jet stream—is behind these severe temperatures. According to Accuweather’s Alex Sosnowski, this pattern may persist through much of August.
August Forecast: More Heat Ahead
Looking forward, the Climate Prediction Center projects that August will continue to be unusually hot throughout most of the U.S., with above-average temperatures likely in nearly every region.
The Role of ‘Corn Sweat’ in Intensifying Heat
The Midwest faces a unique problem: evapotranspiration, known as “corn sweat.” As millions of acres of farmland, especially corn, release moisture into the air, humidity levels rise, making the heat feel even more oppressive. Iowa and Missouri, with vast farmlands, are particularly vulnerable to this phenomenon, which is often compared to being dressed in a sauna.
Recent Heat Records and Background
The past several summers have shattered heat records, with 2024 becoming the hottest year globally—2.3°F warmer than NASA’s 20th-century average. This marked the 15th consecutive month of record-setting temperatures, with July 22, 2024, recognized as the hottest day ever recorded. While 2025 may not surpass 2024, the trend of extreme heat continues.
Health Impacts, Worker Risks, and Limited Protections
Although extreme cold remains deadlier, heat-related deaths are on the rise in the U.S., with over 2,300 fatalities in 2023—a 117% increase since 1999. Outdoor workers are especially vulnerable, yet only five states have comprehensive heat exposure regulations. Most workers lack guaranteed shade, water, or rest breaks. While the Occupational Safety and Health Administration offers recommendations, formal heat-specific standards are pending, with new federal regulations still under review.
