National Weather Service bulletin for New Orleans region
On the evening of August 25, 2005, Hurricane Katrina made landfall as a Category 1 hurricane near the Miami-Dade – Broward county line in southern Florida and weakened into a tropical storm as a result. The next morning, after passing over the state, Tropical Storm Katrina moved into the Gulf of Mexico, strengthened back to hurricane strength, and from the influence of the warm waters from the Loop Current, began undergoing rapid deepening.