Heat dome blankets south-central U.S. as summer ends
A heat dome over the south-central United States produced record-breaking warmth on September 15, 2026, with more than 41 million Americans under extreme heat advisories, watches, or warnings. NASA's GEOS model showed temperatures approaching or exceeding 40°C (104°F) across large portions of Texas, Oklahoma, Arkansas, Missouri, and Tennessee. Meteorologists warned that high humidity, limited cloud cover, and light winds could make conditions feel even hotter and raise the risk of heat-related illness. Several locations set new daily high temperature records. The event arrived as astronomical summer was winding down — a reminder that extreme heat is no longer strictly a seasonal phenomenon.
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The 41 million figure represents about 12 percent of the U.S. population under some form of extreme heat alert on a single day.
What stands out is the timing. Mid-September heat domes of this intensity would have been far less expected a generation ago.