Hurricane Katrina

Storm History

The U.S. National Hurricane Center (NHC) reported on August 23 that Tropical Depression Twelve had formed over the southeastern Bahamas. The numbering of the system was debated, as Tropical Depression Twelve formed partially from the remains of Tropical Depression Ten. The naming and numbering rules at the NHC require a system to keep the same identity if it dies, then regenerates, which would normally have caused this storm to remain numbered Ten. However, the NHC gave this storm a new number because a second disturbance merged with the remains of Tropical Depression Ten on August 20, and there is no way to tell whether the remnants of Tropical Depression Ten should be credited with this storm. (This is different from Hurricane Ivan in the 2004 season, when the NHC ruled that Ivan did indeed reform; the remnant of Ivan that regenerated in the Gulf of Mexico was a distinct system from the moment Ivan originally dissipated to the moment it regained tropical storm strengthhttp://www.nhc.noaa.gov/archive/2005/dis/al122005.discus.001.shtml.)

Related Topics:
National Hurricane Center - August 23 - Southeastern Bahamas - August 20 - Hurricane Ivan - 2004 season - Gulf of Mexico - Tropical storm

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The system was upgraded to Tropical Storm Katrina on the morning of August 24. Katrina became the fourth hurricane of the 2005 season on August 25 and made landfall later that day around 6:30 p.m. between Hallandale Beach and Aventura, Florida.

Related Topics:
August 24 - 2005 season - August 25 - Hallandale Beach - Aventura - Florida

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Katrina weakened over land on August 26, becoming a tropical storm before growing to a Category 2 hurricane with winds of 100 mph. It became clear the storm was headed for Mississippi and Louisiana.

Related Topics:
August 26 - Category 2

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On August 27, the storm was upgraded to Category 3 intensity (major hurricane) and at 12:40 a.m. CDT (0540 UTC) on August 28, Katrina was upgraded to Category 4. Later that morning, Katrina went through a period of rapid intensification, becoming a Category Five storm on theSaffir-Simpson Hurricane Scale. Katrina had maximum sustained winds of 175 mph (280 km/h), gusts of 215 mph (344 km/h) and a central pressure of 26.75 inches, or 906 mbar (hPa), by 1:00 p.m. CDT. It later reached a minimum pressure of 26.64 inches (902 mbar), making it the fifth most intense Atlantic Basin hurricane on record. Katrina's rapid intensification was due in part to its movement over the Gulf Loop Current.

Related Topics:
August 27 - August 28 - Saffir-Simpson Hurricane Scale - HPa - Gulf Loop Current

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Katrina made landfall on August 29 as a Category 4 hurricane with sustained winds of 145 mph (235 km/h) with higher gusts, at 6:10 a.m. CDT near Buras-Triumph, Louisiana. Making its way up the eastern Louisiana coastline, most communities in Plaquemines and St. Bernard Parish, and Slidell in St. Tammany Parish, were severely damaged by storm surge and the strong winds of the eyewall, which also grazed eastern New Orleans. A few hours later, it made landfall for a third time near the Louisiana/Mississippi border with 125 mph (200 km/h) Category 3 sustained winds. However, because the storm was so large, extreme damaging eyewall winds and the strong northeastern quadrant of the storm, pushing record storm surges onshore, smashed the entire Mississippi Gulf Coast, including towns in Mississippi such as Waveland, Bay St. Louis, Pass Christian, Long Beach, Gulfport, Biloxi, Ocean Springs, Gautier and Pascagoula, and, in Alabama, Bayou La Batre. As Katrina moved inland diagonally over Mississippi, high winds cut a swath of damage that affected almost the entire state.

Related Topics:
August 29 - Buras-Triumph, Louisiana - Category 3

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Katrina weakened thereafter, losing hurricane-strength more than 150 miles (160 km) inland, near Jackson, Mississippi. It was downgraded to a tropical depression near Clarksville, Tennessee and continued to race northward.

Related Topics:
Jackson, Mississippi - Tropical depression - Clarksville, Tennessee

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Katrina continued to affect the central US as it moved north, and was last seen in the eastern Great Lakes region on August 31. Before being absorbed by a frontal boundary, Katrina's last known position was over southeast Quebec and northern New Brunswick. On August 31, Katrina became a powerful extratropical low on province of Quebec that gave 50 to 170 mm (1.97 to 6.69 in) of rain in 12 hours; also numerous wind gust from 50 to 98 km/h (31 to 61 mph) were reported in southern and eastern Quebec. In the region of Saguenay and Cote-Nord rain caused breakdown and failure in roads. The Cote-Nord region was isolated from rest of Quebec for at least 1 week.

Related Topics:
Great Lakes - August 31 - Quebec - New Brunswick - Saguenay - Cote-Nord

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Its lowest minimum pressure at landfall was 27.108 inches (918 mbar) (hPa), making it the third strongest hurricane on record to make landfall on the United States. A 10 to 30 foot (3 to 10 m) storm surge came ashore on over 200 continuous miles of coastline, from southeast Louisiana, including Mississippi and Alabama, through to the Florida panhandle. The 30 foot (10 m) storm surge recorded at Biloxi, Mississippi is the highest ever observed in America. Record storm surges that had not occurred in at least the last 150 years, inundated the entire Mississippi coastline, destroying many historic homes. The storm surge in Mobile, Alabama was the highest in that location since 1917, besting the category 3 Hurricane Frederic which hit the city directly in 1979.

Related Topics:
HPa - Storm surge - Biloxi, Mississippi - Mobile, Alabama - Hurricane Frederic

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At 11 p.m. EDT on August 31 (0300 UTC, September 1), U.S. government weather officials announced that the center of the remnant low of what was Katrina had been completely absorbed by a frontal boundary in southeastern Canada, with no discernible circulation.

Related Topics:
August 31 - September 1 - Canada

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The Hydrometeorological Prediction Center's last public advisory on Katrina was at 11 p.m. EDT on August 31 and the Canadian Hurricane Centre's last public advisory on Katrina was at 9 a.m. EDT on August 31.

Related Topics:
Hydrometeorological Prediction Center - August 31 - Canadian Hurricane Centre

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