Were you in this same home during Katrina, or do you know if your street had major flooding? Does your pool have any visible rust? I would stock up on bleach/liquid chlorine and get an extra pool rake. You will probably be without power for several days at a minimum once the storm has passed. There will be debris in the pool to scoop out, and you can also use the pool rake to mix in chlorine. Have an extra pool rake on hand in case your current one breaks. After Ike my pool went from TFP clear to black in 3 days without power and full of debris. We evacuated so it was black when we returned.
If you can disconnect the pump and bring it inside and put it up on a counter or table that will protect it from damage. I would put it in the house or garage. I would not put it in a portable storage shed.
Take photos of every room in your house, garage, and yard from every angle before the storm. Be sure to include a couple of distance shots including the height of trees on your property. This will help document what you had should there be major damage from the storm.
Most importantly evacuate as soon as you can. We evacuated for Rita which was supposed to hit Houston a month after Katrina devastated New Orleans. We left at 2:00 in the morning after my sister reported it took them 6 hours to make the normally 3 hour drive to Nachadoches. It took us 27 hours of bumper to bumper traffic at a top speed of 15 miles an hour. The traffic didn't let up until we got to Lufkin. 18 hours in our journey the storm had turned east but we could not go back because the southbound lanes were full of northbound traffic. I was traveling alone with my young kids since my now ex thought it was important to get his boat to safety and drove towing it through back roads and joined us 48 hours later. I was afraid we were going to be stuck in traffic surrounded by easily uprooted pine trees before we reached my mom's house. We didn't have much food on hand for the trip and everything was closed on the route we were on, since they were all evacuating too. Cell phones were terrible too. You could text but getting a call to connect was next to impossible. It was terrifying.