Isaac weakens to a tropical depression over La.
Isaac Mississippi
A steady armada of utility service trucks drive through Waveland, Miss., to assist residents left without power from Hurricane Isaac, Thursday, Aug. 30, 2012. Signs of life returned to the Mississippi Gulf Coast on Thursday as curfews were lifted and some businesses and roads reopened, but many residents still couldn't make it home because of flooding in low lying areas and along rivers. (AP Photo/Rogelio V. Solis)