Much of the U.S. is under extreme heat warnings or advisories while New York, Philadelphia and Washington could feel like 100 degrees or more.

KCAL News has issued a Next Weather Alert for the inland communities on Thursday, as peak heat arrives on the last day of a three-day heat wave.

At least 100 Americans are on alert for dangerous heat and humidity -- stretching from Texas to Maine -- on Friday.

A triple-digit heat wave arrives in Southern California on Wednesday, affecting inland communities, increasing health concerns.A KCAL News Next Weather Alert is in effect through Friday for the Inland ...

The National Weather Service has issued heat advisories for large parts of Southern California amid a heat wave expected to start July 9.

California extends Thursday's Flex Alert by 2 hours with ... Southern Californians can expect a slight break from the intense temperatures this weekend but an excessive heat wave will remain in ...

Southern California braced for critical fire weather and heat-related illnesses as several parts of the region are expected to approach or reach triple-digit heat. Above-normal temperatures are ...

Numerous states could see heat index values higher than those expected in Death Valley on Thursday, according to the NWS.

At least two U.S. states are at an elevated risk of wildfires Tuesday amid "critical fire weather conditions." ...

Heat doesn’t just mean canceled events. It also poses a health risk. If you can’t afford to cool the whole house, make a “cool space” to sleep in.

A study released by UCLA on Monday suggests that the world's heat waves are not only increasing in frequency but getting ...