A heat wave is currently affecting about 160 million people, according to the National Weather Service. Here's which states ...

More than 160 million Americans are under the highest level of extreme heat alerts during a wave of above-average ...

"Dangerous heat will intensify across much of the Northeast and Mid-Atlantic early this week," meteorologist Jacob Hinson said.

Heat exhaustion and heatstroke can be brought on by extremely high temperatures. How to keep others and yourself safe.

Heat waves are primarily caused by high-pressure systems that push warm air down onto an area and hold it there. During heat ...