Storm history of Hurricane Katrina
As the atmospheric conditions surrounding Tropical Depression Twelve were good for tropical development, the system began to strengthen, was upgraded to Tropical Storm status and given the name Katrina on the morning of August 24. A burst of convection allowed Katrina to become the fifth hurricane of the 2005 season on August 25, only two hours before it made landfall around 6:30 p.m. EST (2230 UTC) between Hallandale Beach and Aventura, Florida.