A powerful jet streak could set the stage for the outbreak of severe weather across parts of the U.S. over the weekend.

Climate scientists have long watched the jet stream with fascination and growing concern. These rivers of air racing across our planet at altitudes of roughly 5-9 miles dictate much of our day-to-day ...

Tornadoes, winter storms and even hurricanes - chances are you've heard at least one of those phenomena mentioned in the same sentence with the jet stream. The basic trough and ridge pattern of a jet ...