Move your most valuable possessions that you can't take with you to higher points within your home. Turn off gas, water, electricity. Check to see that you have done everything to protect your property from damage and loss. Lock windows and doors. Never attempt to drive through water on a road.
Water can be deeper than it appears, and water levels rise very quickly.
Most cars will float dangerously for at least a short while. A car can be buoyed by floodwaters and then swept downstream during a flood. Wade through floodwaters only if the water is not flowing rapidly and only in water no higher than the knees. If a car stalls in flood-water, get out quickly and move to higher ground. The flood-waters may still be rising, and the car could be swept away at any moment.