National Centers for Environmental Information

A heat wave affecting 40 million people in central and southern US regions persisted for a second day, with heat indexes exceeding 105°F and some areas reaching 120°F. The National Weather Service attributed the extreme temperatures to a heat dome, leading to canceled events like a horse race in Minnesota and warnings about health risks for vulnerable groups. Moist air also increased severe weather risks around the Great Lakes.

A sweltering heat wave affects central and southern US for the second consecutive day, with extreme heat warnings in effect for tens of millions. Heat indices over 105°F and temperatures up to 120°F in parts of the southwest are linked to a heat dome, while authorities warn vulnerable groups about risks like heat stroke.

A heat wave with temperatures exceeding 105°F (40.5°C) and heat indices up to 120°F (49°C) is affecting central and southern U.S. regions for a second consecutive day, driven by a heat dome. Authorities warn vulnerable groups like children, older adults, and those with medical conditions about risks of heat stroke, as the continental U.S. recorded the second-hottest first half of the year in 2026.

A severe heat wave affects central and southern U.S. regions for a second day, with heat indices exceeding 105°F (40.5°C) and temperatures reaching up to 120°F (49°C) in parts of the southwest. The prolonged extreme heat is caused by a stationary heat dome, and authorities warn vulnerable populations about risks like heat stroke. The continental U.S. experienced the second-hottest first half of the year on record in 2026.