‘Extraordinarily hot’: US heatwave stretches on with millions still under warnings

Southern and central states from California to Mississippi face heat indexes above 100F amid another heat dome

At least 40 million people were under extreme heat warnings across central and southern parts of the United States on Sunday as high temperatures and severe humidity gripped large swaths of the country for a second straight day.

Heat indexes well above 100F (38C) stretched from Minnesota down to Mississippi, extending west into southern California and Nevada. Parts of the south-west were expected to see highs of 120F (49C), according to the National Weather Service.