Polar Vortex Redux? Bone-chilling Cold to Envelop Midwest, East Coast

So far, the winter of 2014-15 has not been particularly cold or snowy for much of the East Coast. In fact, the winter so far has been noteworthy for its frequent ups and downs, with wild swings from mild to cold conditions every few days. But the biggest swing — and in this case, a nosedive — is about to take place. Starting early in the first full week of January, a mass of frigid, Arctic air is going to slip south from northern Canada, crossing the U.S. border and spilling south and eastward with time. http://on.mash.to/1xB3Cw7 http://bit.ly/1fJ5yqZ