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 ...

Bay County, Florida is experiencing a major heat risk with maximum heat indices exceeding 110 degrees Fahrenheit. Little nighttime relief is expected, increasing the risk of heat illnesses for ...

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.

The heat index could get as high as 111 in South Florida, with the strongest heat expected along the southern Gulf Coast. Temperatures are expected to climb into the mid 90s over inland areas, with ...

The heat index, or apparent temperature, combines air temperature and humidity to indicate how hot it feels to the body. High humidity slows sweating, the body's natural cooling system, making ...

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 ...