Conditions are hot and humid in Michigan and getting hotter as the week goes on. Forecasters often refer to the heat index as a way to measure the "feels like" temperature. Here's a look at what that ...

"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 ...

What does the "heat index" mean and how does it apply to people? -- S.S., Tulsa. The World Almanac and Book of Facts, updated annually, always includes the heat index ...

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.” ...

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 ...

Florida is under a heat advisory with dangerous heat index values expected to reach 110-115 degrees. The heat dome affecting the South may cause record high temperatures and poses extreme heat risks.

Heat advisories have been issued across Florida, with heat index values expected to reach 110-115 degrees. The heat dome affecting the South may cause record high temperatures in the Southeast. Heat ...

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 ...