Millions face dangerous heat in California, Arizona and Nevada as record March temps blamed on climate change sweep the nation.

Parts of California and Arizona were under extreme heat warnings again Saturday while sweltering summerlike weather even ...

A record-breaking heatwave afflicting the western half of the United States moved eastward Saturday toward the center of the country, bringing unseasonably warm temperatures to places that were at ...

Extreme heat warnings have been issued for parts of the Southwest U.S., with temperatures soaring above 100 degrees Fahrenheit, while Nebraska also experiences unusually high temperatures for early ...

Wildland firefighters say the unprecedented surge is driving overtime and exhaustion, with no clear break in dangerous ...