"It's not the heat, it's the humidity." Actually, it's both, and that's where the National Weather Service's heat index comes in. Also known as the apparent temperature, the heat index is a number ...

The sticky combination of heat and high humidity can be more than uncomfortable -- it can be deadly. Mario Tama/Getty Images You’ve probably heard people say, “It’s not the heat, it’s the humidity.” ...

CHICOPEE, Mass. (WWLP) – Western Massachusetts temperatures will reach into the 90s again Tuesday with heat index values over 100 degrees. When talking about heat and humidity, we use a term called ...

MOLINE, Ill. — The Storm Track 8 Weather Team is tracking another round of significant heat and humidity with temperatures soaring into the 90s and heat index values exceeding 100 degrees this weekend ...

AND CONDITIONS ARE GOING TO BE WARM FOR A COUPLE MORE DAYS. BUT WE DO HAVE SOME RELIEF IN SIGHT MOVING FORWARD. OFFICIALLY AT PTI AIRPORT, WE HAD 93 DEGREES YESTERDAY, NOT THE HOTTEST DAY IN THIS ...

ORLANDO, Fla. — Central Florida is under a heat advisory on Friday, with temperatures expected to reach a heat index of 104 to 109 degrees. The advisory comes as the region experiences a combination ...

HUNTSVILLE, Ala. (WAFF) - Good Wednesday morning. Fair skies and muggy temperatures in the middle to upper 70s will greet you as you head out the door this morning. Today is a 48 First Alert Weather ...

PIEDMONT TRIAD, N.C. (WGHP) —A Heat Advisory will be in effect from 10 a.m. until 8 p.m. for Chatham County. We have a couple more hot, humid days ahead before a cold front ushers in cool, drier ...

The heat index is a measure of how hot it really feels on your body when relative humidity is factored in with the actual air temperature. Since heat index values were devised for shady, light wind ...