Your thunderstorms come with tidal surges that overtop levees and back up rivers?
Well, "yes" to overflowing levees. And we do get flash floods that back up rivers by piling trees and debris against bridges. We also get golf ball size hail and mudslides. We've had a couple of storms where local houses slid down the side of a hill.
In fairness, we are above sea level.
Ask him if he has nutrias.
And take away everything standing miles inland?