Hurricane Katrina was one of the five deadliest storms in United States history. She is the costliest natural disaster. She is ranked as the third most intense storm to make Untied States land-fall after the 1935 Labor Day Hurricane and Hurricane Camille. Katrina was officially reached hurricane status in the morning of August 25, 2005. She was formed from a mixture of a tropical wave and the remnants of Tropical Depression Ten. After making land-fall two hours later between Hallandale Beach, Florida and Aventura, Florida, she weakened back to Tropical Storm status. An hour later after entering the Gulf of Mexico, she regained hurricane status and on August 27 she became a category three hurricane. A problem with the eye wall caused to slow down the intensity of the storm but cause Katrina to grow almost double in size. August 28 was when she reached both category five hurricane and reached the peak of her strength (image on the left shows what Katrina looked like at the time). She made land-fall again as a category three hurricane near the city of Buras-Triumph in Louisiana. During her third land-fall moment, Katrina was still a category three hurricane. She was downgraded to a Tropical Depression near the Clarksville, Tennessee. The damage in New Orleans from Katrina was caused by the Levee systems failing and causing massive flooding of 80% of the city. The total cost of damage is 108 billion dollars.