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 ...

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.” ...

Tonight features an isolated risk for a downpour before midnight. With light winds, recent rainfall and clearing skies, patchy dense fog will form, which could reduce visibilities to below a quarter ...