Tom Ackerman Reports on Hurricane Isaac from New Orleans

Hurricane Isaac has hit the US Gulf Coast, and forecasters are warning that tornadoes could appear over the states of Alabama, Mississippi, and Louisiana. The storm has already brought winds of up to 130 kilometres per hour. In New Orleans, the city's flood system will get its first real test after Hurricane Katrina devastated the area exactly seven years ago. That's where Al Jazeera's Tom Ackerman is reporting.