A heat dome is forecast to send temperatures soaring across much of the central and eastern U.S. over the July 4 holiday, with forecasters warning that extreme heat could affect millions of Americans ...

More than 60 percent of Americans will experience extreme heat and humidity in the days ahead.

The weather phenomenon known as a "heat dome" - a large area of high pressure that traps heat and humidity - could lead to dangerously high ‌temperatures, with heat indices set to hit 105 ‌to 115 degr...