Everyone should make a plan before the time a decision is needed. Know where/what and communicate your plan to family. You have to make the decision ASAP and be ready to go.
We have evacuated for previous hurricanes. Three duffel bags filled with photos and one change of clothing.
I keep a master notebook organized with important documents and papers. It would be packed first. Then enough water and snacks for everyone as the stores are already empty. I keep an emergency box filled and ready in the pantry. Supplies are checked and ready each May just in case. We could be out of here in about 30-45 minutes if needed.