Author: Matt Gilligan / Source: did you know?
The last several days we’ve all been inundated with stories and photos of the polar vortex that descended on the Midwest and caused temperatures to plummet to lows not seen in decades. Residents of Illinois, Minnesota, Wisconsin, North Dakota, and other states experienced temperatures as low as 30 degrees below Fahrenheit, with harsh wind chills that make even going outside a risky decision.
But what exactly is a polar vortex?
A polar vortex is defined by NASA as “a whirling and persistent large area of low pressure, found typically over…
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