This July 4th could be hottest ever in parts of U.S. Maps show the forecast expected to break records.

Extremely dangerous heat, coupled with humidity, could result in heat index readings of 100 to 115 degrees from the Midwest ...

Are you one of the millions of Americans trapped in a 'heat dome?'

Track extreme heat alerts with this interactive map.

Where, when and how bad the Fourth of July heat wave will be, in seven diagrams, charts and maps

The U.S. is looking at an unwelcome birthday gift: a dangerous heat wave arriving ahead of the holiday weekend. Limited time: ...