For the second time in a year, a tornado touched down in New Orleans and crossed the Mississippi River into Arabi, La. A large are of disturbed weather blasted through southeast Louisiana, leaving at least one person dead, tens of thousands without power and an unknown number of buildings with damage, primarily on the west bank of Jefferson Parish, areas of St. John Parish and St. Bernard Parish. It was an extremely rare severe weather setup with chances of tornadoes given the second highest risk rating - a 4 out of a possible 5.  A first round of unstable weather in the early afternoon left one person dead and seven others injured in St. Charles Parish, while a second round spawned at least one tornado that struck and left several buildings damaged in Marrero and Gretna on Jefferson Parish's west bank before heading across the river to St. Bernard Parish in a path eerily similar to one earlier this year that devastated parts of Arabi.  By 5 p.m., most of the severe weather had left the metro New Orleans area, giving people a chance to assess damage.