"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 ...

Add Yahoo as a preferred source to see more of our stories on Google. The sticky combination of heat and high humidity can be more than uncomfortable -- it can be deadly. Mario Tama/Getty Images ...

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 ...

Another steamy day with the heat index value expected between 99-102 Tuesday.A heat advisory is in place through 8 a.m. WednesdayThere will be far fewer downpours (most towns stay dry) Tuesday, ...

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 ...

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 ...

A warming trend moving into Michigan could last into next week and bring high heat indexes to the southeast portion of the state, the National Weather Service said. "Increasing heat and humidity ...

ORLANDO, Fla. – Big heat, daily storms and increasing flood potential continue through the next few days across Central Florida. From dangerously high heat index values to rounds of strong storms and ...

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 ...

You’ve probably heard people say, “It’s not the heat, it’s the humidity.” There’s a lot of truth to that phrase, and it’s important to understand it as summer temperatures rise. Humidity doesn’t just ...