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|Category 5 major hurricane (SSHWS/NWS)|
|Formed||August 23, 2005|
|Dissipated||August 30, 2005|
1-minute sustained: 175 mph (280 km/h) |
|Lowest pressure||902 mbar (hPa); 26.64 inHg|
$108 billion (2005 USD)|
(Costliest hurricane in US history)
|Areas affected||Bahamas, South Florida, Cuba, Louisiana (especially Greater New Orleans), Mississippi, Alabama, Florida Panhandle, most of eastern North America|
|Part of the 2005 Atlantic hurricane season|
Hurricane Katrina was a hurricane in the 2005 Atlantic hurricane season. It was the most expensive natural disaster, as well as one of the five deadliest hurricanes, in the history of the United States. Parts of the states of Mississippi and Alabama were also badly damaged or flooded. It was the most expensive and one of the deadliest natural disasters in the history of the United States (at $108 billion in damage). Over 1,800 people were killed by the storm, with 1,577 in Louisiana and 238 in Mississippi. However, the worst property damage was in coastal areas of Louisiana, Mississippi and Alabama, such as all Mississippi beachfront towns, which were flooded over 90% in hours, as boats and casino barges rammed buildings, pushing cars and houses inland, with waters reaching 6–12 miles (10–19 km) from the beach. In Alabama, large fishing boats, a small ship, and an oil rig came ashore, as beach homes and coastal buildings were flooded by waters 11–22 ft deep (3–6 m).
Hurricane Katrina was the eleventh tropical storm, fifth hurricane, and the second Category 5 hurricane of the 2005 Atlantic hurricane season. The storm formed over the Bahamas on August 23, where it moved east and hit Florida as a Category 1 hurricane two days later. Katrina then crossed over Florida and strengthened into a Category 5 hurricane in the Gulf of Mexico. The storm then hit Louisiana and Mississippi on the morning of August 29. The leftovers of Katrina then died out over the Great Lakes on August 31.
The damages Katrina brought were so bad that 80% of New Orleans was flooded when the levees to the city broke. Most of the people killed by Katrina were thought to have died from drowning. Because of Katrina's effect on the US, the hurricane was known to be one of the most deadly hurricanes in US history.
|Rank||Hurricane||Season||Cost (2008 USD)|
|Main article: List of costliest Atlantic hurricanes|
Hurricane Katrina began as Tropical Depression Twelve over the southeastern Bahamas on August 23, 2005. The depression later strengthened into a tropical storm on the morning of August 24 where the storm was also named Katrina. Katrina continued to move into Florida, and became a Category 1 hurricane only two hours before it made landfall around Hallandale Beach on the morning of August 25. The storm weakened over land, but became a hurricane again while entering the Gulf of Mexico.
Katrina began to gain strength very quickly after entering the Gulf, partly because of the storm moving over to the warm waters of the Gulf of Mexico. On August 27, Hurricane Katrina reached Category 3 strength on the Saffir-Simpson Hurricane Scale, becoming the third major hurricane of the season. An "eyewall replacement cycle" once made Katrina stop becoming stronger for a short moment, but made Katrina to become nearly twice as large in the end.
Katrina again began to quickly strengthen, reaching Category 5 strength on the morning of August 28 and reached its strongest point with maximum sustained winds of 175 mph (280 km/h) and a minimum central pressure of 902 mbar. Katrina's minimal pressure measurement made it the fourth most powerful Atlantic hurricane on record at the time, only to be beaten by Hurricanes Rita and Wilma later in the season. In addition, Katrina was also the strongest hurricane ever recorded in the Gulf of Mexico at the time (a record also later broken by Rita).
Katrina made its second landfall on August 29 as a Category 4 hurricane with sustained winds of 125 mph (205 km/h) near St. Bernard, Louisiana. At landfall, hurricane-force winds reached outward 120 miles (190 km) from the center and the storm's central pressure was 920 mbar. After moving over southeastern Louisiana, it made its third landfall over New Orleans, Louisiana and the levees where not made to withstand that much water and ended up collapsing leading to massive flooding. Katrina kept its hurricane strength well into Mississippi, but began to weaken later, finally losing hurricane strength more than 150 miles (240 km) inland near Meridian, Mississippi. Katrina weakened to a tropical depression near Clarksville, Tennessee, but its remains were last seen around the eastern Great Lakes on August 31 when it died. The leftover extratropical cyclone moved quickly to the northeast and affected Ontario and Quebec.
American movie maker Spike Lee made a HBO documentary "When The Levees Broke" that shows the extensive damage in New Orleans after Hurricane Katrina. The documentary suggests that the damage caused was due to the inability of the levees to weather the storm or a probable sabotage. The documentary also suggests that the federal government did a poor job of disaster management. Resources arrived after several days. Most of the people who died did so from drowning.
- See also: List of retired Atlantic hurricane names
The name Katrina was retired for the record breaking damage, the deaths, and the economic impact. This means that it will not be used as a name for any new storms in the future. A new name, Katia, replaced it for 2011.
- 2005 Atlantic hurricane season
- Hurricane Rita
- Meteorological history of Hurricane Katrina
- Hurricane Katrina tornado outbreak
- National Weather Service bulletin for New Orleans region
- List of hurricanes in Florida
- "Reports of Missing and Deceased." Louisiana Department of Health and Hospitals. 2006-08-02. Retrieved on 2010-04-14.
- Swenson, Dan D; Marshall, Bob (May 14, 2005). "Flash Flood: Hurricane Katrina's Inundation of New Orleans, August 29, 2005" (SWF). Times-Picayune. http://www.nola.com/katrina/graphics/credits.swf.
- Knabb, Richard D; Rhome, Jamie R.; Brown, Daniel P (December 20, 2005; updated August 10, 2006). "Tropical Cyclone Report: Hurricane Katrina: 23 – 30 August 2005" (PDF). National Hurricane Center. http://www.nhc.noaa.gov/pdf/TCR-AL122005_Katrina.pdf. Retrieved 2006-05-30.
- Leben, Robert; Born, George; Scott, Jim (September 15, 2005). "CU-Boulder Researchers Chart Katrina's Growth In Gulf Of Mexico". University of Colorado at Boulder. http://www.colorado.edu/news/releases/2005/358.html. Retrieved 2006-06-05.
- National Hurricane Center's Tropical Cyclone Report on Hurricane Katrina
- National Hurricane Center's archive on Hurricane Katrina
- Hurricane Katrina Rainfall Information from HPC
- Hydrometeorological Prediction Center's archive on Hurricane Katrina
- NASA's Hurricane Katrina Archive
- Geology and Hurricane-Protection Strategies in the Greater New Orleans Area Louisiana Geological Survey publication on Hurricane Katrina