Over the next two weeks, extreme levels of humidity are forecast to hit around 40 states, with the first wave of very muggy weather building in central and eastern states through Thursday. Across ...

An AccuWeather forecast map showed states in the "high" risk zone for Friday included parts of Kentucky, Illinois, and Indiana. As the weekend approaches, the severe threat expands further south.

This week is delivering the hottest temperatures of the year so far to much of the eastern United States. See detailed maps about the latest heat index forecasts. Note: Forecast data is as of 8:16 ...