The first widespread, significant heat wave of the summer is underway, as a massive heat dome intensifies into the Fourth of July weekend.

Half of all Americans are facing prolonged, dangerously heat as they head outdoors to celebrate the country’s 250th Independence Day.

A massive Western heat wave and a potential El Niño event raise concerns about a long stretch of unpredictable and extreme weather. But starting this week, the West is experiencing what looks to be a record-breaking heat wave, while forecasting models ...

The nation's hottest official temperature climbed to 107 degrees, while the coldest reading fell to 19 degrees. Here's where