I have to laugh at those 3 month supply of meals sold as a real answer to emergency provisions; BOILING WATER for reconstitution of said meals is not available to millions along the Gulf Coast. Water quality is also questionable at this point as well.
A video of a well placed closed circuit camera out of the UK shows a storm that arrived with a storm surge larger than Katrina. Katrina was 20 feet, this storm exceeded that and arrived immediately and not gradually. That immediacy of that storm surge would have killed if anyone was still along that shoreline. There was no surviving it.
It will take a month if not longer to reconstruct any electricity to those areas effected. There is swamp conditions which will imperil those workers trying to restore the grid.
There are other storms coming so returning to this region is not advised. The people of the Gulf Coast need to consider resettlement or life on a boat. I doubt houseboats will survive such wrath of water and wind.