Hurricane Katrina was a devastating Category 5 Atlantic hurricane that caused 1,836 fatalities and damage estimated between $97.4 billion to $145.5 billion in late August 2005, particularly in the city of New Orleans and its surrounding area.
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It is the costliest hurricane to ever hit the United States, surpassing the record previously held by Hurricane Andrew from 1992. In addition, Katrina is one of the five deadliest hurricanes to ever strike the United States.
During and after Hurricane Katrina, many of those levees and floodwalls were overtopped and several were breached, allowing billions of gallons of water from the Gulf of Mexico, Lake Borgne, and Lake Pontchartrain to flow into New Orleans and flood major portions of the city.
There is officially no such thing as a Category 6 hurricane. But the idea of revising or adding to the scale has been discussed by some climate scientists who believe the current categories may not be adequate for increasingly extreme storms in the future.