Where in the world did the thunderstorm form that eventually became hurricane katrina?

The answer is "Off the coast of West Africa". The thunderstorm, which formed off the coast of West Africa eventually formed and became Hurricane Katrina. Hurricane Katrina is one of the five deadliest hurricanes in the history of the United States. Its destruction destroyed $108 Billion damages in total. It was one of the vicious and most destructive cyclones.