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

What is heat index and how does it affect how stifling excessive heat feels?

Delaware will face dangerously high temperatures and heat index values as a heat wave takes hold of the region. The First ...

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

New York state has entered its first heat wave of the summer - with highs expected to soar into the upper 90s and even past ...

The heat index shows how humidity makes hot days feel hotter, and why direct sun can push dangerous conditions even higher.

Delaware will feel a dangerous heat wave starting Wednesday as temperatures start surging into triple digits. The National ...

Florida has a well-earned reputation for its muggy, humid summers. Which heat is worse: Florida's "wet blanket" or Arizona's ...

As summer temperatures rise, dairy cows are at greater risk for heat stress. Heat-stressed cows suffer from reduced dry ...

COLUMBUS, Ohio — A major heat wave is expected to grip much of the United States, including Ohio, over the next week. High ...

Extreme heat warnings have been issued for the entire state July 1. An extreme heat warning for New Castle County will take ...