Park extra cars in high rise car parks such as office buildings. Of course as for promission and give management contact info.
Ice coolers are great for storage of important papers. They keep water out and float so if you need to wade in high water everything stays dry.
Have cash, sometimes credit card machines are not working.
Travel light, you can't take everything.
Have insurance papers, phone numbers and call as soon as you know of damage. Insurance is a slow process so get ahead of others who wait. Take photos of all damages.
Be prepared for one week on your own, food, water, etc. With large areas of damage help is slow and need is great. So have the basics.
Useful info—thanks for sharing.