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Polar vortex map reveals which states are about to freeze in Arctic air

A fresh blast of Arctic air is poised to spill across a wide swath of the United States, and the latest polar vortex map ...
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How the jet stream influences storms and heatwaves

The jet stream, or any wind, is the result of differences in surface temperature. In simple terms, warm air rises, creating low pressure, and cold air sinks, creating high pressure. Wind is the ...