Hurricane Katrina in the Gulf of Mexico - Hurricane Katrina was the costliest hurricane in US history, totaling more than $75 billion in 2005 (more than $100 billion in 2009) in damages. Hurricane Katrina formed from a tropical wave fed by the remnants of TD10. On August 23, 2005, TD12 formed just in the Bahamas. The tropical storm moved west and strengthened into Tropical storm Katrina. Its next target was Northern portions of Miami-Dade County. On August 24-25, Katrina strengthened to a Category 1 hurricane, while 50 miles east of Miami-Dade County. When it hit, Katrina dumped over 15 inches of rain in Southern Miami-Dade county, prompting flooding. With winds of 70-75 mph, the storm exited Florida Bay, and underwent explosive deepening in the Gulf of Mexico. By August 27, the storm reached Category 3 strength, then strengthening more to a Category 5 hurricane, the highest category on the Saffir-Simpson Scale. By August 30, having weakened to Category 3 strength, Katrina made landfall in Louisiana and Alabama. Katrina ravaged the Louisiana Coastline for 6 hours before moving north. In its wake, Katrina created a scene that no one wanted to see again; people getting sick, people cannot get out of the Astrodome, and no buses and no travel. It took 6 days to get the entire personnel out of the dome., and it took 5 years to clean up 20% of the damages left by Katrina. All in all, Katrina was the worst hurricane in 2005's super season.