A heat wave hit much of the central U.S. over the weekend, while snow and cool temperatures arrived in the Northwest.

More than 160 million Americans are under the highest level of extreme heat alerts during a wave of above-average ...

The northern lights, also known as the aurora borealis, may be visible in as many as 15 northern states between Tuesday night ...

The National Oceanic and Atmospheric Administration expects several states in the northern U.S. to have an opportunity to see ...