Cold air returning to the United States today and tomorrow is causing the word “Polar Vortex” to be tossed around again. Arctic air is on the way, but the bitter cold air will not make as deep into the south as it did in early January. The bitter cold will remain over the northern plains as temperatures in places like North and South Dakota will be 30 and 40 degrees below zero!
It will get colder here in North GA. Temperatures will only reach the 40s for highs on Wednesday, then dip into 20s. So the coldest air we will feel this week will be over us on Thursday morning. We will gradually warm up as we get into the weekend.
The polar vortex, is not a storm but a "planetary-scale mid- to high-latitude circumpolar cyclonic circulation, extending from the middle troposphere to the stratosphere," according to a portion of the American Meteorological Society's recently updated definition.