By Alex Sosnowski, Expert Senior Meteorologist
January 21, 2014
Bitterly cold air is again settling southward from the Arctic into a large part of the Eastern states. Unlike the outbreak from early January, this time the cold will have more staying power.
Into the first part of next week, the polar vortex will hover just north of the United States border causing waves of frigid air to blast into the Midwest and much of the East.
The polar vortex is a commonly used term among the meteorological community to describe an intense storm with frigid air and strong winds that spends much of its time above the Arctic Circle. Occasionally, during the autumn, winter and spring, this storm can dip farther south, approaching the mid-latitudes.
The first of several waves of arctic air will continue to advance to the south Wednesday.
Already Tuesday morning, RealFeel® temperatures plunged to minus 40 F over the Upper Midwest and were below zero as far south as portions of the Ohio Valley and as far east as northern New England.