april 28th, 2011. good evening, i m cynthia mcfadden. here in london, where it is 4:35 in the morning, and in just a few hours, prince william, the future king of england, will enter westminster abbey behind me to begin a very public new phase of his life. marying the woman whom he has asked to be his queen, catherine middleton. today, the prince walked out onto the mall here and greeted well wishers packing the parade route. echoed his mother, princess diana, beloved by the public. before we turn to the celebration about to take place here in london, we turn to the tragic story unfolding tonight across a great swath of america, as thousands there are mourning tonight for loved ones lost in the terrible or the nay domes that have brought unimaginable destruction over so much of the south. abc s jim avila is there in concord, alabama. reporter: a record-breaking 173 tornadoes tore through 14 states. super cells, biblical in size and strength, ripping through homes and deva