"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 ...

Temperature is one of the primary factors in every weather forecast, but when we get into the dog days of summer, it’s just not that simple. We have to use something called the “heat index” to ...

ANGELES. WELL, WE ALL KNOW HOW HOT IT GETS HERE DURING THE SUMMER IN SOUTH FLORIDA, BUT IT ACTUALLY FEELS MUCH HOTTER WHEN YOU FACTOR IN THE HUMIDITY. FIRST WARNING METEOROLOGIST BROOKE SILVERING ...

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, ...

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 ...

Central Florida will see extreme heat on Tuesday, with highs between 96 and 101 degrees and heat index values reaching up to 118. A few isolated thunderstorms may develop in the afternoon, but most ...

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 ...