The soil there is very porous, the storm drainage is very good, and there are no hills or depressions, so it takes like 4 inches of rain in one hour to cause real flooding.
The only time I ever saw standing flood water one day after a storm in Lauderdale was in the mid-1960s.
We got 12 inches of rain in four hours.
My street, which gently sloped from west (land) to east (ocean) looked like a river!
Article states the supercell dropped 12-20” of rain.