On August 25, two hours before making landfall at Hallandale Beach, it strengthened into a hurricane. Early the following day, the depression intensified into a tropical storm and headed generally westward toward Florida. Katrina began on August 23, 2005, with the merger of a tropical wave and the remnants of Tropical Depression Ten. It was also the fourth-most intense Atlantic hurricane to make landfall in the contiguous United States, gauged by barometric pressure. Katrina was the twelfth tropical cyclone, the fifth hurricane, and the third major hurricane of the 2005 Atlantic hurricane season.

At the time, it was the costliest tropical cyclone on record, later tied by Hurricane Harvey of 2017. Hurricane Katrina was a devastating Category 5 Atlantic hurricane that caused 1,836 fatalities and damage estimated between $97.4 billion to $145.5 billion in late August 2005, particularly in the city of New Orleans and its surrounding area. Works related to Katrina sources at Wikisource.Media related to Hurricane Katrina at Wikimedia Commons.Part of the 2005 Atlantic hurricane season Louisiana (especially Greater New Orleans).South Florida, Central Florida and the Florida Panhandle.

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