Hurricane Katrina first made landfall in the United States on August 25, 2005, between Hallandale Beach and Aventura in Florida as a Category 1 hurricane, causing heavy rainfall and local flooding there

. It then moved into the Gulf of Mexico, where it intensified to a Category 5 hurricane. The major and most destructive landfall occurred on August 29, 2005, near Buras in southeast Louisiana as a Category 3 hurricane with sustained winds around 125 mph. The storm's eyewall passed over southeastern Louisiana and then made a second landfall near the Louisiana-Mississippi state line, affecting cities such as Bay St. Louis and Waveland in Mississippi

. The hurricane caused catastrophic damage along the Gulf Coast, particularly in Louisiana and Mississippi. New Orleans was severely flooded after levees protecting the city were breached, submerging about 80% of the city under water

. The Mississippi Gulf Coast experienced an extreme storm surge up to 27 feet, devastating coastal communities including Biloxi, Gulfport, and Pascagoula

. The storm also impacted parts of Alabama and the Florida Panhandle with strong winds and storm surge

. In summary, Hurricane Katrina hit:

• Florida (initial landfall, August 25)
• Southeastern Louisiana near Buras (major landfall, August 29)
• Mississippi Gulf Coast near the Louisiana border (second landfall, August 29)
• Also affected Alabama and the western Florida Panhandle with tropical storm conditions and surge