Hurricane Katrina was one of the deadliest hurricanes to ever strike the United States and the second Category 5 hurricane of the record-breaking 2005 Atlantic hurricane season. The storm formed over the Bahamas on August 23, where it moved west and hit south Florida as a Category 1 hurricane two days later. Katrina then crossed over Florida and strengthened into a Category 5 hurricane moving west in the Gulf of Mexico. The storm then turned north, had an eyewall replacement cycle, and hit east Louisiana and Mississippi, flooding coastal areas on the morning of August 29. The leftovers of Katrina then died out over the Great Lakes on August 31.