Michigan is heating up this week. Two southwest counties are already under a heat advisory because of dangerous heat index ...

The Pensacola area is under a heat advisory for the second day in a row. A cluster of showers and thunderstorms will offer ...

The National Weather Service already has issued extreme heat warnings, watches and advisories across a swath of the Midwest ...

The National Weather Service has announced a Heat Advisory for the entirety of the Quad Cities viewing area from this heat.

The heat index considers the actual temperature and amount of moisture in the air using the dew point or relative humidity.