It's time for the 9th annual Mid-Atlantic snowfall contest!   Those who participated last year will doubtless recall the excitement of that contest in which measurable snow managed to fall at BWI International (BWI), Reagan National (DCA), and Dulles International (IAD) on exactly one day -- February 1st. And even that did not happen at Richmond International Airport (RIC), where the snow gods pitched a shutout. However, we all know things will be different this time around because it is not a L