Hurricane Katrina
The most notable of the three Category 5 hurricanes was 
. Katrina caused over $100 billion (USD) in damage and 1,383 deaths, especially along Mississippi and Alabama coastlines which suffered catastrophic damage. The storm also caused levees to break in New Orleans leading to the flooding of the city which is located below sea-level. The United States government, the city government of New Orleans, and the government of the State of Louisiana were all severely criticized for their handling of the storms aftermath. Hurricane Katrina, although not yet certified, is most likely the costliest hurricane in U.S. history. 
Tropical Storm Zeta becomes second cross-season tropical storm in history