A severe heat wave continues across the central and southern United States for a second straight day, bringing dangerously high temperatures and oppressive humidity to wide areas. Multiple outlets report that tens of millions of people are placed under extreme heat warnings as conditions remain intense through Sunday. The coverage describes heat as widespread across the central and southern regions, with forecasts indicating sustained high temperatures rather than a quick break. The combination of extreme heat and severe humidity increases health risks, particularly for vulnerable groups, prompting authorities to issue heat alerts and warnings for large portions of the affected states. Both reports characterize the event as ongoing rather than isolated, emphasizing that it is the second consecutive day of the heat wave gripping the region. While the specific affected areas and exact temperature readings are not detailed in the provided excerpts, the common theme is that extensive sections of the central and southern U.S. experience hazardous heat conditions and that public warnings are in effect for large numbers of residents.