Cool, wet stretch: Temperatures 5–10°F below normal, frost risks, and periods of rain will persist in the Northeast through midweek before warmer air arrives this weekend. El Niño gaining strength: ...

A new study challenges the idea that climate change is behind the erratic wintertime behavior of the polar jet stream, the massive current of Arctic air that regulates weather for much of the Northern ...

Most summers, the polar jet stream retreats northward into Canada and weakens considerably, leaving the continental U.S. with calmer weather. When rainstorms pop up, they're typically caused by ...