Storm historyMain article: Meteorological history of Hurricane Katrina
Hurricane Katrina formed as Tropical Depression Twelve over the southeastern Bahamas on August 23, 2005 as the result of an interaction of a tropical wave and the remains of Tropical Depression Ten. The system was upgraded to tropical storm status on the morning of August 24 and at this point, the storm was given the name Katrina. The tropical storm continued to move towards Florida, and became a hurricane only two hours before it made landfall between Hallandale Beach and Aventura, Florida on the morning of August 25. The storm weakened over land, but it regained hurricane status about one hour after entering the Gulf of Mexico.[1]
The storm rapidly intensified after entering the Gulf, partly because of the storm's movement over the warm waters of the Loop Current.[4] On August 27, the storm reached Category 3 intensity on the Saffir-Simpson Hurricane Scale, becoming the third major hurricane of the season. An eyewall replacement cycle disrupted the intensification, but caused the storm to nearly double in size. Katrina again rapidly intensified, attaining Category 5 status on the morning of August 28 and reached its peak strength at 1:00 p.m. CDT that day, with maximum sustained winds of 175 mph (280 km/h) and a minimum central pressure of 902 mbar. The pressure measurement made Katrina the fourth most intense Atlantic hurricane on record at the time, only to be surpassed by Hurricanes Rita and Wilma later in the season; it was also the strongest hurricane ever recorded in the Gulf of Mexico at the time (a record also later broken by Rita).[1]
Katrina made its second landfall at 6:10 a.m. CDT[1] on August 29 as a Category 3 hurricane with sustained winds of 125 mph (205 km/h) near Buras-Triumph, Louisiana. At landfall, hurricane-force winds extended outward 120 miles (190 km) from the center and the storm's central pressure was 920 mbar. After moving over southeastern Louisiana and Breton Sound, it made its third landfall near the Louisiana/Mississippi border with 120 mph (195 km/h) sustained winds, still at Category 3 intensity.[1]
Katrina maintained strength well into Mississippi, finally losing hurricane strength more than 150 miles (240 km) inland near Meridian, Mississippi. It was downgraded to a tropical depression near Clarksville, Tennessee, but its remnants were last distinguishable in the eastern Great Lakes region on August 31, when it was absorbed by a frontal boundary. The resulting extratropical storm moved rapidly to the northeast and affected Ontario and Quebec.[1]
PreparationsMain article: Preparations for Hurricane Katrina
Federal government
Flanked by Michael Chertoff, Secretary of Homeland Security, left, and Secretary of Defense Donald Rumsfeld, President George W. Bush meets with members of the White House Task Force on Hurricane Katrina Recovery on August 31, 2005, in the Cabinet Room of the White House.
On the morning of August 26, at 10 a.m. CDT (1500 UTC), Katrina had strengthened to a Category 3 storm in the Gulf of Mexico. Later that afternoon, the NHC realized that Katrina had yet to make the turn toward the Florida Panhandle and ended up revising the predicted track of the storm from the panhandle to the Mississippi coast.[5][6] The NHC issued a hurricane watch for southeastern Louisiana, including the New Orleans area at 10 a.m. CDT August 27. That afternoon the NHC extended the watch to cover the Mississippi and Alabama coastlines as well as the Louisiana coast to Intracoastal City.
The United States Coast Guard began pre-positioning resources beyond the expected impact zone starting on August 26, and activated more than 400 reservists.[7] Aircrews from the Aviation Training Center, in Mobile, staged rescue aircraft from Texas to Florida.[8] All aircraft were returning back towards the Gulf of Mexico by the afternoon of August 29. Air crews, many of whom lost their homes during the hurricane, began a round-the-clock rescue effort in New Orleans, and along the Mississippi and Alabama coastlines.[9]
President George W. Bush declared a state of emergency in Louisiana, Alabama, and Mississippi two days before the hurricane made landfall.[10] (These declarations later proved to be a point of controversy; see below.) That same evening, the NHC upgraded the section of the hurricane watch from Morgan City, Louisiana to the Alabama-Florida border to a hurricane warning, 12 hours after it was issued, and also issued a tropical storm warning for the westernmost Florida Panhandle.[1]
During video conferences involving the President on August 28 and 29, the director of the National Hurricane Center at the time, Max Mayfield, expressed concern that Katrina might push its storm surge over the city's levees and flood walls. In one conference, he stated, "I do not think anyone can tell you with confidence right now whether the levees will be topped or not, but that's obviously a very, very great concern."[11]
On August 28, as the sheer size of Katrina became clear, the NHC extended the tropical storm warning zone to cover most of the Louisiana coastline and a larger portion of the Florida Panhandle. The National Weather Service's New Orleans/Baton Rouge office issued a vividly-worded bulletin predicting that the area would be "uninhabitable for weeks" after "devastating damage" caused by Katrina, which at that time rivaled the intensity of Hurricane Camille.[12]
Voluntary and mandatory evacuations were issued for large areas of southeast Louisiana as well as coastal Mississippi and Alabama. About 1.2 million residents of the Gulf Coast were covered under a voluntary or mandatory evacuation order.[1]
Emergency declarations
In a September 26, 2005 hearing, Michael Brown was questioned by Republican members of Congress about FEMA's response. During that hearing, Representative Stephen Buyer (R-IN) inquired as to why Bush's declaration did not include Orleans, Jefferson, or Plaquemines parishes.[13] (In fact, the declaration did not include any of Louisiana's coastal parishes, whereas the coastal counties were included in the declarations for Mississippi[14] and Alabama.[15]) Brown testified that this was because Governor Blanco had not included those parishes in her initial request for aid, a decision that he found "shocking." After the hearing, though, Blanco released a copy of her letter, which requested assistance for "all the southeastern parishes including the New Orleans Metropolitan area and the mid state Interstate I-49
Gulf Coast
On August 26, the state of Mississippi activated its National Guard in preparation of the storm's landfall. Additionally, the state government activated its Emergency Operations Center the next day, and local governments began issuing evacuation orders. By 7:00 p.m. EDT on August 28, 11 counties and eleven cities issued evacuation orders, a number which increased to 41 counties and 61 cities by the following morning. Moreover, 57 emergency shelters were established on coastal communities, with 31 additional shelters available to open if needed.[3] Louisiana's hurricane evacuation plan calls for local governments in areas along and near the coast to evacuate in three phases, starting with the immediate coast 50 hours before the start of tropical storm force winds. Persons in areas designated Phase II begin evacuating 40 hours before the onset of tropical storm winds and those in Phase III areas (including New Orleans) evacuate 30 hours before the start of such winds.[17]
Many private care-taking facilities that relied on bus companies and ambulance services for evacuation were unable to evacuate their charges. Fuel and rental cars were in short supply and many forms of public transportation had been shut down well before the storm arrived.[18] Some estimates claimed that 80% of the 1.3 million residents of the greater New Orleans metropolitan area evacuated, leaving behind substantially fewer people than remained in the city during the Hurricane Ivan evacuation.[19]
By Sunday, August 28, most infrastructure along the Gulf Coast had been shut down, including all Canadian National Railway and Amtrak rail traffic into the evacuation areas as well as the Waterford Nuclear Generating Station.[20] The NHC maintained the coastal warnings until late on August 29, by which time Hurricane Katrina was over central Mississippi.[1]
Greater New Orleans area
See also: Hurricane preparedness for New Orleans
Vertical cross-section of New Orleans, showing maximum levee height of 23 feet (7 m)
By August 26, the possibility of unprecedented cataclysm was already being considered. Many of the computer models had shifted the potential path of Katrina 150 miles (240 km) westward from the Florida Panhandle, putting the city of New Orleans right in the center of their track probabilities; the chances of a direct hit were forecast at 17%, with strike probability rising to 29% by August 28.[21] This scenario was considered a potential catastrophe because some parts of New Orleans and the metro area are below sea level. Since the storm surge produced by the hurricane's right-front quadrant (containing the strongest winds) was forecast to be 28 feet (8.5 m), emergency management officials in New Orleans feared that the storm surge could go over the tops of levees protecting the city, causing major flooding.[22]
At a news conference at 10:00 a.m. on August 28, shortly after Katrina was upgraded to a Category 5 storm, New Orleans mayor Ray Nagin ordered the first ever mandatory evacuation of the city, calling Katrina "a storm that most of us have long feared."[23] The city government also established several "refuges of last resort" for citizens who could not leave the city, including the massive Louisiana Superdome, which sheltered approximately 26,000 people and provided them with food and water for several days as the storm came ashore.[24]
Florida
Many people living in the area were unaware when Katrina strengthened from a tropical storm to a hurricane in one day and struck southern Florida near the Miami-Dade – Broward county line. The hurricane struck between the cities of Aventura, in Miami-Dade County, and Hallandale, in Broward County, on August 25, 2005. However, National Hurricane Center (NHC) forecasts had correctly predicted that Katrina would intensify to hurricane strength before landfall, and hurricane watches and warnings were issued 31.5 hours and 19.5 hours before landfall, respectively — only slightly less than the target thresholds of 36 and 24 hours.[1]
Florida Governor Jeb Bush declared a state of emergency on August 24 in advance of Hurricane Katrina's landfall in Florida. Shelters were opened and schools closed in several counties in the southern part of the state. A number of evacuation orders were also issued, mostly voluntary, although a mandatory evacuation was ordered for at-risk housing in Martin County.[25]
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