Heat is the number one killer -- and it’s heading to the most densely populated part of America for a prolonged period.

The first major U.S. heat wave of the year starts on Friday. It brings dangerously high temperatures and is expected to last ...

Summer temperatures can often reach dangerous levels, even in states like Connecticut that aren't known for extreme heat. The state averages more than 500 emergency room visits each year due to ...

The first of two rounds of extreme heat is underway for parts of the eastern half of the US, the opening act for a potent and widespread heat dome that will send temperatures to dangerous, ...