Thursday is the last day of the official 2017 hurricane season. It's been the most destructive year in recorded history, according to the National Hurricane Center, causing what may turn out to be more than $200 billion in damages. It's also the first time that three Category 4 hurricanes have hit the United States in the same year.
For all the ruination in Texas, Florida and Puerto Rico, at least Americans could see the hurricanes coming. TV networks covered the storm tracks exhaustively. But what happens to an American city when a hurricane strikes without warning?