How climate change has powered the heat wave blanketing much of the U.S. A massive heat dome has been spreading across much of the United States this month, with temperatures reaching historic highs.

The city of Chicago is preparing for this week's heat wave with less than an hour to go before an Extreme Heat Warning takes effect for all of Cook County through Wednesday night.

Meteorologists are reaching for superlatives to describe an oncoming heat wave so intense and rare for this time of year that it could leave some locations shattering their all-time temperature ...

Gov. Kathy Hochul and Westchester health officials urge residents to prepare for dangerous heat, with heat index values reaching 110 degrees.

A marine heat wave is causing ocean temperatures to rise along the U.S. West Coast. The warmer water is disrupting the food chain, causing seabirds and other wildlife to starve. Scientists warn the ...