I guarantee you that they are on high alert with their best minds analyzing the data.
As of this moment, they are predicting what would be the worst natural disaster in American history.
Yes, things could change and likely will. But it's been my experience that when all the computer models (except the worthless A98E) reach the same solution, it's a done deal.
It realistically would take months to pump out all the water in New Orleans. That's what we're potentially facing.
They haven't even called any kind of evacuation as yet!