https://www.cnet.com/news/as-polar-vortex-2019-rolls-in-twitter-rolls-out-the-star-wars-hoth-memes/

Blame something called the polar vortex. CBS News describes it as a whirling mass of cold air that "usually stays closer to the poles, but sometimes breaks apart, sending chunks of Arctic air southward into the US during winter."  This week, the cold air is coming all at once, CBS meteorologist Jeff Berardelli writes.

You can't beat the cold, but you can survive it. Stay inside, if you can. Bundle up in layers, if you can't. Keep your gas tank full, pack a car emergency kit and make hot soup. And have a sense of humor about it, as these Twitter users did.