The Pacific Ocean along the equator is where a phenomenon called La Niña develops. La Niña is the “cool sister” to El Niño.

The start of winter is just a few weeks away, and it could be a stormy season for parts of the United States, weather ...

The polar vortex is making a return to the forecast, but the counterintuitive weather feature is nothing to fear.

The Earth's polar vortex is stirring up, bringing the first hints at changing weather as fall descends on the U.S. This movement means gradual cooling and a more active storm track across the northern ...