A line of vehicles departing the Florida Keys in advance of Tropical Storm Fay enters the Florida peninsula on U.S. in Florida City, Aug. 17, 2008. Monroe County Emergency Management officials began mandatory visitor evacuation for all the Keys beginning on Sunday morning due to the approaching storm. The Florida National Guard activated its Joint Emergency Operations Center in St. Augustine and established unit planning cells across the state this weekend, as Florida Governor Charlie Crist signed an Executive Order to support operations in advance of Tropical Storm Fay.