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

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 ...

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

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

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

As summer temperatures rise, dairy cows are at greater risk for heat stress. Heat-stressed cows suffer from reduced dry matter intake, reducing milk production. Farmers may also notice reduced ...

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 ...

The temperature reading in Central Park tied a record for July 2 set in 1966. Some 163 million people, from Missouri to Maine ...

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

Florida has a well-earned reputation for its muggy, humid summers. Which heat is worse: Florida's "wet blanket" or Arizona's "furnace"? What does heat index really mean? Heat-related symptoms to watch ...