If reading winter forecasts doesn't send a chill down your spine, stepping outside will. In some regions of the country, temperatures are dropping below freezing, and some portions of the Midwest are ...
Above: A Von Karman vortex street downwind of the Canary Island chain in the eastern Atlantic Ocean off the coast of Africa on Feb. 27, 2015. Image credit: NASA Worldview. Editor's note: Meteorologist ...
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