The heat wave caused disruptions to public transport across the Northeast. Amtrak said it will be forced to slow train speeds ...

Sometimes the temperature outside feels warmer than it is, and there's a reason. Here's a breakdown of the heat index.

Weather experts explain the science behind "feels like" temperatures as the region experiences dangerous heat conditions ...

It's because of something called the heat index. The heat index measures what the air temperature combined with the level of humidity feels like to the human body, the National Weather Service says.

Hundreds of people working or playing outside – even those who seem healthy – succumb to heat-related illnesses each year.

An 'extreme heat watch' is in effect as the heat index is expected to skyrocket. Here's timing, updated heat index values, more.

The heat index is expected to soar this weekend. Here's what to know about the scale, potential dangers and how to protect yourself from UV radiation.

“With every fraction of a degree of warming, the UK will experience hotter, more dangerous heatwaves,” said Ben Clarke, researcher at the Centre for Environmental Policy at Imperial College London.