A brutal heat wave across the eastern United States trapped millions of people in sweltering air this week with record-high ...

The NWS heat index maps show exactly where the worst of the heat is ... The CDC offers the usual symptoms: 103°F or higher body temperature, hot and flushed (sometimes wet) skin, fast pulse, headache, ...

Extreme heat is impacting states across the country. See maps of high temperature forecasts and heat index levels.

A heat wave is currently affecting about 160 million people, according to the National Weather Service. Here's which states feel the hottest.

Sometimes the temperature outside feels warmer than it is, and there's a reason. Here's a breakdown of the heat index.

Heat waves like this one can put people at risk of heat exhaustion or the even more serious condition of heat stroke.

The heat wave has arrived. Temperatures and humidity are climbing as the tri-state heads into an expected record-shattering ...