The phrase “historic polar vortex” evokes a country locked in ice from the Great Lakes to the Gulf, but the most reliable records show a patchwork of extreme outbreaks rather than a single, weeks-long ...

The polar vortex phenomena is making this December much colder than average. Students should prepare themselves for changes ...

Cross-polar flow is a phenomenon that describes the movement of air over the North Pole. For U.S. context, this generally ...

Parts of Texas are likely to be hit with unusually cold temperatures as a polar vortex looks set to push frigid winds across the country. Why It Matters Some forecast models have suggested lobes of ...