Scorching temperatures persist as heat wave expands, with record-breaking temperatures expected across U.S.

A relentless heat wave that baked more of the United States this past week is expected to continue and expand this weekend.

Millions of Americans – particularly those in the highly populated Interstate 95 corridor are under heat-related advisories or alerts as the squelching heat is expected to hit record-breaking temperatures in some areas. In some places, the humidity will bring the heat index values as high as the mid-100s.

Forecasters with the National Weather Service (NWS) said Saturday they expect the high temperatures to be in the mid-to-upper 90s from the central and southern Plains to the East Coast.