A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of ...

Jet streams are air currents formed by the collision of warm tropical air and cold polar air in the atmosphere, plus the rotation of the planet. When meteorologists in North America mention “the ...

But here’s where things get interesting: the polar vortex’s behavior is closely tied to the jet stream, a fast-moving river of air that flows high above the Earth. The jet stream acts like a ...

“Typically going from west to east, and formed at the boundary between significantly different air temperatures, like between cold polar air and warmer tropical air.” “The jet stream is ...

The jet stream typically acts as a barrier to keep the polar vortex contained near the Arctic, but at times, some of the vortex can break off or move south, bringing unusually cold weather into ...

According to the NWS, the Arctic polar vortex is a powerful band of west-to-east winds that develops in the stratosphere, ...

“The jet stream is a fast flowing, narrow current of air high up in the Earth's atmosphere,” said Knox. “Typically going from west to east, and formed at the boundary between significantly different ...