Hurricane Katrina began as a tropical depression in the Bahamas and took a path northward through Cuba, then westward through south Florida before making its final landfall near the Louisiana-Mississippi border. It then moved northeast through Mississippi before dissipating and being downgraded to a tropical depression near Clarksville, Tennessee.
Katrina first reached hurricane status after passing across the southern reaches of Florida's peninsula and entering the Gulf of Mexico. It was upgraded to Category 5 while in the Gulf, but it had just weakened to Category 3 intensity when it made its second landfall in Louisiana. It further weakened but maintained Category 3 intensity at its third landfall, and at that point, it was the third strongest hurricane to ever make landfall in the United States. It continued at hurricane strength as it moved through Mississippi but weakened enough to be downgraded just after crossing into Tennessee.