Much of the U.S. is under a blanket of oppressive heat as people prepare for a sweltering July 4th holiday. It’s during times like these that you often hear people talk about the “heat index” when ...

Whether a summer day is great or awful often comes down to the humidity.

Temperatures are skyrocketing for the third straight day across the Eastern US, but there’s at least three different ways to say how hot it really is.

Michigan's heat wave this week will feel even warmer because of high humidity. Here's how the heat index works.

Today's extreme heat for the World Cup match between Portugal and Croatia is expected exceed world soccer union guidelines based on the "wet bulb" temperature. That's already happened for a number of ...

The oppressive air mass will likely linger into Friday, though showers could bring some some relief.

We are in for a stretch of sweltering weather as high temperatures and humidity settle in.

The metric of how hot the air actually feels has roots in a 1979 journal paper called “The Assessment of Sultriness.” By Andy Newman In recent days, you may have seen or heard many mentions of a ...

Officials warn the prolonged heat significantly increases the risk of heat-related illness, especially for those spending ...

Exercising outside in high temps can be a health hazard. Here's how to read your local index, according to a doctor, so you can stay safe.