TWIN CTNP's winter's much smaller coldest grip

~Weakens winter were it should be strongest

~Creates smaller atmospheric mesoscale regions susceptible to migrate along the real polar vortex waves.  

Again not an Arctic blast affected some parts down South,  because the temperature anomaly chart makes the Arctic +5 to +20 C above normal:

Courtesy NOAA

   While in Atlanta 2" of snow turned to ice paralyzed the great Southern city,
historically not a frequent event. There seems to be a disconnect between a warmer Arctic and regionally small extreme cold weather.  The concept most TV weather spoke persons never talk about is the concept of isolated coldest atmospheres affecting regions not accustomed.  There are 2 at present,  one in Siberia, the other over North Eastern North America, both have weaker winds at 250 mb Center.

Courtesy NOOA

    The jet stream usually sits next to where the coldest atmosphere exists, if the size of the coldest air extent diminishes the jet bends more and is less expanded towards the equator.    CTNP's in black rotate counterclockwise.

       
       The bigger Cold temperature North Pole cell is over Siberia, which injects cold air west of the Urals.    The  North American Cell is way smaller and will not last.
It gradually diminished over quite some time,  being well South of its usual location demolished its strength and area, unfortunately to the detriment of people not use to snow.  The North Pole,  still in darkness  is quite warm despite the presence of a high pressure immediately next to it.  The dual CTNP nature will evolve further, likely being prominent in Russia, not so over North America.  Along with this change comes the different weather and essentially warmer temperatures.  WDJan30, 2014