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

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

Maps show where extreme humidity and 90- or 100-degree temperatures will affect about 255 million people across the United ...

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

Several states are expecting extreme heat, with the heat index, or feels-like temperature, surging past 100 degrees.

The National Weather Service has extended the heat advisory for central Ohio until June 27. COTA has extended free rides as a ...

Unless society stops pumping more greenhouse gases in the air, “we can expect multiple factors to worsen summer extremes,” a ...