Yes, keep extra cash on hand and not in bank.
Funny you should mention the banking friend and his move. I have been hearing that same type of thing about a lot of retired military people and others in the know are heading to mountains in Missouri as a safe haven from something. And for some reason they are looking for high elevation. There is a future Navy map of the USA that shows some changes to the US that many refer to. I don’t know how legit it is, but if it is it shows some considerable geographical changes to the US.