~At present the Dakotas USA -36 C 700 mb temperature is the coldest in North America
~Most weather medias present this latest "Polar Vortex" event originating from the Arctic
~But the Arctic upper air is warmer than the Dakota CTNP (Cold Temperature North Pole), how does this happen?
The frequent misnomer used by weather medias naming and blaming "Arctic Air" is not quite always accurate, in this case the colder air vortice built itself well South of the Arctic, which means, a thinner continental snow cover canopy twinned with clear air with low sun elevation at noon , along with longer dark nights than daylight can create colder than Arctic temperatures in the South of it. A rapid Plains USA fluctuation in temperatures is soon to follow , with upcoming much warmer temperatures in a few days, is merely a representation on how thinly spread out the cold air areas are, or not really re-enforced by the Arctic, but rather a fleeting happenstance generated by a steady in origin large Anticyclone. WD January 30, 2019