Thanks for your local experience dealing with Houston. Out here in SA, there are various places to egress if needed[lol Austin]. But, we are fortunate not to have the population an density of Houston.
Nor do you have hurricanes in San Antonio. What you have is swarms of people coming from Houston! ha!
With a natural disaster there is always a place to go unless the entire country is affected. You might play hell getting there but you still have a designation to go to that hasn’t been affected by the disaster.
With a nation wide SHTF unless you have your own place to go to there wont be anyplace to go if you live in a city.
With nation wide SHTF anywhere you go will be just like where you left.
A kind hearted stranger might take you in but finding a kind hearted stranger willing to take in stranger in a SHTF isn’t likely and it’s not something I would count on.
I’m not saying you should stay where you are regardless of what happens but the idea you can leave one city and go to another one and everything will be better is just wishful thinking. You could end up stuck on the road with millions of other people ready to take everything you have.