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Since 9:30am, “polar vortex” has been tweeted more than 4,800 times. But what is it?

A polar vortex isn’t a special move Mortal Kombat’s Sub-Zero does when you press down+right+B on the controller. It’s a large wintery cyclone that made a rare appearance over the midwest Monday, dropping degrees far lower than usual time-for-a-Netflix-marathon levels.

Temperatures plunged to negative 23 degrees Fahrenheit around Minneapolis and minus 12 in Chicago. Hundreds of schools and government offices closed for the day. 

Since 9:30am Monday morning, “polar vortex” has been tweeted more than 4,800 times, mostly by people who don’t know what the heck it is. 

Some of the best guesses people have made so far:

While polar vortexes (vortices?) are typically “found around either the north or south poles,” the U.S. has seen several this winter season.

Jason Samenow, the chief meteorologist for the Washington Post’s Capital Weather Gang blog, said “the polar vortex will bring some of the lowest temperatures in decades. … About 115 million people were under a wind chill warning, watch or advisory Sunday.”


Photo by torremountain/Flickr

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