A few things to watch:
One of the misleading aspects of how we rate hurricanes is that their strength is measures by windspeed, yet the worst damage often comes from the water they shift or drop.
Hurricane Katrina hit NOLA as a cat-III in 2005, but did its worst damage via severe flooding.
The @NHC_Atlantic is calling that storm surge "unsurvivable", which is not a term thrown around lightly.
There are no natural disasters, only natural hazards. Whether a hazard becomes a disaster depends on the vulnerability it encounters.
The people who can't evacuate, don't have emergency reserves, can't access online or cell phone based services, fare the worst.
Despite all the grief it gets (some deserved) FEMA is actually pretty good at what it does. And in TX and LA is has good state-level counterparts to work with.
So if this ends up being a normal-ish event, the system should work OK.
That takes coherent White House leadership and coordination to work.
/end