The polar vortex, explained

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Temperatures in the Midwest are nearing all-time record lows as a powerful polar vortex drives a deep freeze across the eastern half of the United States.
The bitter cold will bring below-zero temperatures to a quarter of the continental USA. In fact, it is predicted that Chicago will be colder than Antartica, Siberia, and Mount Everest.

Extreme cold, big snowstorms – and even unwelcome invasions from the polar vortex – will continue to hit the U.S., even as humans continue to warm the planet.

As he has several times in the past, President Trump again tweeted about global warming during a cold snap: Late Monday, he tweeted that “in the beautiful Midwest, windchill temperatures are reaching minus 60 degrees, the coldest ever recorded…What the hell is going on with Global Warming? Please come back fast, we need you!”

However, no matter how much humans have warmed the planet, we still didn’t kill winter: Trump’s own federal agency – the National Oceanic and Atmospheric Administration – corrected the president on Tuesday, noting that “winter storms don’t prove that global warming isn’t happening.”

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