A polar vortex is an upperlevel lowpressure area lying near one of the Earth's poles. There are two polar vortices in the Earth's atmosphere, overlying the North and South polar vortex is a persistent, largescale, lowpressure zone less than 1,000 kilometers (620 miles) in diameter, that rotates counterclockwise at the North Pole and clockwise at the South Pole (called a cyclone ...
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