Once the Philadelphia region gets past the heat wave, unstable air returns, and the storm door will open through the weekend.

New York’s Central Park tied a record high of 96 degrees for the date Monday, which was set in 1888. In neighboring New ...

Scientists say extreme heat waves are a clear sign of global warming, and they are expected to become more frequent, longer, ...

An intense and nearly historic weather pattern is cooking much of America under a dangerous heat dome this week with triple-digit temperatures in places that haven't been so hot in more than a decade.