It's time for the 12th annual Mid-Atlantic snowfall contest!    Those who participated last year will recollect an exciting contest through mid-February, when a blockbuster snowstorm seemed poised to produce a major change to our leaderboard.  However, the storm turned south, and largely missed our contest airports. That left two of our entrants tied for first place, with many others close behind.  But no one gained ground after that because snow was done for the season in these parts and @