As Pittsburgh's temperatures climb toward triple digits, these are the key heat-related weather terms you should know.

Unrelenting heat and humidity will continue this week with the heat index reaching over 105 all week long.

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

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 ...

Forecasters are especially focused on this weekend, which doubles as a milestone Fourth of July holiday weekend and a World ...

Brace yourself for more heat and humidity. From Wednesday to Friday our heat index could be above 105 making them all First ...

The heat and humidity will continue to build across Northeast Florida and Southeast Georgia this week. In fact, temperatures ...

After the gorgeous Wednesday, the heat and humidity are making a gradual comeback for the rest of the week in the tri-state ...

Heat advisories have been issued for 31 of Florida's 67 counties July 8, with more expected through the remainder of the week ...

TOMORROW: Thursday is another scorcher of a day with highs in the low to mid 90s but heat index values 103-108 with partly ...