Millions could see their first snowfall of the season this weekend as cold air brings the threat of snow to 13 states.

Mapping out geology across the U.S. is surprisingly difficult, but the USGS has managed just that, and its map is more ...

Good news for skywatchers: The auroras are coming back! For those in the northern states, the aurora borealis, or northern lights, are likely to appear this week, according to the National Oceanic and ...

Canadian wildfires are causing poor air quality in parts of the U.S. Air quality alerts have been issued for several states, advising precautions for sensitive groups. The EPA has designated air ...