As a survivor of both CAT 5's last year, I strongly encourage whoever lives in the strike area to prepare well.
I had experienced CAT 4's before, but there is an order of magnitude in terms of violence between that and a 5.
If you live in an area prone to flooding or in a house made out of wood you should seek shelter somewhere else. Take the warning seriously. Don't think that "Hurricane-proof construction" applies to a CAT5, because it doesn't. Over 4,000 people died down here last year. Many of them because they didn't take proper precautions.
Get canned food for about 4 weeks, a solar lantern, and one of those portable water filters. An inverter generator and some fuel may make your life easier during the first days. That is specially important if someone in your household needs medical equipment such as apnea machines.
Expect to lose the basic services for a while. Even underground utilities can be affected by landslides, and flooding. They are also often damaged by the efforts of the first responders. A CAT5 can topple or damage cellular communication towers as well as core power trunk towers.
Good luck (you are going to need it), and well come to the exclusive CAT5 club.