Polar Vortex - The "Polar Vortex" of 2014 - Pictures - CBS News Chicago hit a record low of -16 degree Fahrenheit this morning as a polar air mass called a "Polar Vortex" brought the coldest temperatures in about two decades into the city. In this satellite handout image provided by National Oceanic and Atmospheric Administration (NOAA), shows the entry of a large area of low pressure, from the Polar Vortex, into the Northern U.S. on January 6, 2014. Credit: NOAA via Getty Images Passengers heading into downtown wait on an 'L' platform for the train to arrive in below zero temperatures on January 7, 2014, in Chicago, Illinois. Platforms were crowded and trains were delayed because doors on the trains kept freezing open. Chicago experienced its third consecutive day of below zero temperatures. Credit: Gerry Images Sundogs, a ring of light visible around the sun or moon when light is refracted through ice crystals in the atmosphere, are quite beautiful along Highway 83 north of Bismark, N.D. Credit: AP Photo Ryan Metcalf tries to hang on to his golden retriever, Daisy, Sunday, Jan. 5, 2014, in Brentwood, Mo. Metcalf said that Daisy loves the snow. Snow-covered roads and high winds were creating dangerous driving conditions from Missouri to Delaware on Sunday ahead of a "polar vortex" that'll bring below-zero temperatures not seen in years to much of the nation in the coming days, likely setting records. The Tidal Basin freezes over near the Jefferson Memorial in Washington January 7, 2014. Credit: REUTERS/Gary Cameron Credit: AP Photo/Seth Perlman Commuters make a sub-zero trek to offices in the Loop on January 6, 2014 in Chicago, Illinois. Michael Stanton walks between houses covered in ice from sea spray along the shore in Scituate, Mass., Friday, Jan. 3, 2014. Wind-whipped, fluffy snow continued to fall across the state, buffeted by wind gusts at around 40 miles per hour. National Weather Service reported Friday morning that the temperature in Boston was 2 degrees, but 20-below when the wind chill is factored in. Credit: AP Photo/Michael Dwyer In an image made with a fisheye lens, Marguerite Johnston uncovers her car in Grosse Pointe, Mich., Monday, Jan. 6, 2014. Credit: AP Photo/Paul Sancya Hank Wade is bundled up as he clears snow from a sidewalk Monday, Jan. 6, 2014, in Lyndhurst, Ohio. Forecasters say low temperatures around zero, with possible wind chill factors of 40 below zero, are possible through Wednesday. The entire state was under a rare wind chill warning, which means frostbite could affect exposed skin within 10 minutes outside. Credit: AP Photo/Tony Dejak Temperatures not seen in years are likely to set records in the coming days across the Midwest, Northeast and South, creating dangerous travel conditions and prompting church and school closures. Mist rises from Lake Michigan as temperatures dipped well below zero on January 6, 2014, in Chicago, Illinois. Credit: Scott Olson/Getty Images A woman bundled against the cold walks past a homeless man in McPherson Square as temperatures dipped into the single digits Fahrenheit and minus degrees with the wind chill on January 7, 2014, in Washington, D.C. A deadly blast of arctic air shattered decades-old temperature records as it enveloped the eastern United States on Tuesday, canceling thousands of flights, driving energy prices higher and overwhelming shelters for homeless people. A sculpture near a walking path is covered in snow in Carmel, Indiana, north of Indianapolis, January 6, 2014. Credit: REUTERS/Brent Smith