The Deep South of the United States was hit with a rare snowstorm, the result of a collision of air pressure systems moved by ...
Winter storms are about to blitz through the eastern half of the United States at a frenetic pace that could continue for a ...
A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of the arctic blast.
The map below shows ... laden subtropical jet stream. The path of the polar jet was nudged southward by lobes of the polar vortex that dipped into the United States, providing ample cold air.
As the Arctic rapidly warms, the temperature difference between the polar region and lower latitudes decreases, which weakens ...