A sweaty Fourth of July ahead for the US as extreme heat descends on 20 states

An extreme heat wave affecting 20 U.S. states, including Illinois, Indiana, Ohio, and Kentucky, is expected to persist through the weekend with temperatures exceeding 100 degrees and heat indices reaching 115. The National Weather Service has issued warnings, emphasizing risks of heat-related illnesses, while events like the Great American State Fair and Fourth of July celebrations face challenges due to the sweltering conditions.