The polar vortex that iced over sidewalks, froze traffic and chilled spines across the East Coast in February is making a comeback on the heels of Typhoon Neoguri. Thankfully it couldn't have ...

Americans are bracing for more freezing weather. JOSEPH PREZIOSO/AFP via Getty Images NOAA's website explains that: "The polar vortex is a stream of cold air that normally circles the Arctic.