A warming Arctic weakens the jet stream, unleashing the polar vortex and bringing on even colder winter storms
the West Coast over the past two weeks, and the winter storms now heading for the East Coast and Europe. It’s not just cold weather—an unstable jet stream can also lead to severe heat waves, droughts, or excessive amounts of rain. And the polar jet stream appears to be weakening,The jet stream, which circles the northern latitudes of the northern hemisphere in a tight band, works as a barrier, keeping the swirling mass of freezing air over the North Pole—the polar vortex—contained.
It’s kind of like a bicycle: the faster you pedal, the more stable the ride. But slow down too much and your front wheel starts to wobble. Those wobbles, or dips in a slower-moving jet stream, allow the polar vortex to plunge further south. Wobbles in the opposite direction can bring unseasonably warm weather north. They can also
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