Step 1: Learning (or not) from experience
"Be prepared" means get ready for the worst and don't count on that lucky break. Remember the bad experience and dismiss the good one. Evacuating under a blue sky, even though it might make you feel like a slightly hysterical nutcase (especially if the storm does not deliver the anticipated damage), is still much better than doing so in waist high, filthy floodwater. Some people did not evacuate because they remembered only the last storm, Irene, which missed them, and they forgot about Katrina. Some paid a heavy price.