Don't start Googling 'polar vortex' yet, but Chicago feels big change in the wind

Did you feel it fellow Chicagoans? That unmistakable and shockingly brisk chill in the air when you walked out of your residence this morning? Here it is not even mid-September and plunging temperatures in the Chicago area are no doubt bringing back — much too soon — memories of the hideous and unending winter that local residents endured earlier this year, thanks in no small part to the dreaded — yes it has to be referenced here — polar vortex...