has the potential to put the nation's capital in its most snow they've seen in five years. six inch could come down. look at that band from dallas out toward pittsburgh. the temperatures literally a three-degree range over a thousand-mile stretch of land when you go west to east. to the north and south drop there in memphis toward jackson, a 20-degree temperature drop. in mississippi, there's tupelo hometown birthplace of elvis, at the freezing mark. 32 fahrenheit. drop down some 300 miles to hattiesburg and temperatures at 73 fahrenheit. that north-to-south gradient significant. the cold air going to move in. a lot of snow going come with it. and 5,600 flights canceled wednesday. another 2,100 preemptively in place for thursday. the airports philly d.c., baltimore, seeing problems. icing a concern, as well across the southern tier of the u.s. here we go with the snowfall. pink areas, 10 to 12 inches. continues until the northeast. new york city today could see as much as six, maybe eight inches.