Hurricane Katrina was the deadliest and most destructive hurricane in the 2005 Hurricane season. Hurricane Katrina formed on the 23rd of August 2005 and disassembled on the 30th of August 2005. The winds got up to 280 km/h (175 mph). The areas most affected by Hurricane Katrina were Bahamas, Cuba, South Florida, Louisiana (especially New Orleans), Mississippi and Alabama. Hurricane Katrina started off as a Category 1 Hurricane then grew to a Category 5 over the warm water of the Gulf Sea, the huge hurricane hit south east Louisiana as a Category 3 hurricane.