Extreme heat is impacting states across the country. See maps of high temperature forecasts and heat index levels.

Multiple regions of the country faced the possibility of severe weather on Thursday, according to forecasters.

A new study published in the journal Proceedings of the National Academy of Sciences presents the first comprehensive map of autumn stopover hotspots of landbirds for the eastern United States.

Polluted air will remain a threat Friday for millions of Americans across the eastern United States as the Canadian wildfires continue to send smoke billowing across the region, tinging the skies ...