Images: Take a look back at Hurricane Katrina

Bryan Vernon and Dorothy Bell are rescued from their rooftop after Hurricane Katrina hit, causing flooding in their New Orleans neighborhood, Monday Morning, Aug. 29, 2005. Officials called for a mandatory evacuation of the city, but many residents remained in the city. ASSOCIATED PRESS

Looters make their way into and out of a grocery store in New Orleans on Tuesday, Aug. 30, 2005. Flood waters continue to rise in New Orleans after Hurricane Katrina did extensive damage when it made landfall on Monday. ASSOCIATED PRESS

St. Tammany Parish Fire District 3 fireman Mark Frosch helps Reine Duron-Irias as other firemen help her daughter, Gloria Irias, and granddaughter, Trincice Johnson, after they were evacuated from their Lacombe, La. home on Monday, Aug. 29, 2005. The flood surge from Lake Pontchartrain came up two miles inland. ASSOCIATED PRESS

Rescuers use an old row boat to evacuate children and an elderly woman from their flooded homes in Gulfport, Miss., after Hurricane Katrina struck the Gulf Coast Monday, Aug. 29, 2005. ASSOCIATED PRESS

A woman cries as she waits with other flood victims at the Convention Center in New Orleans, Thursday, Sept. 1, 2005. Officials called for a mandatory evacuation of the city, but many residents remained in the city and had to be rescued from flooded homes and hotels and remain in the city awaiting a way out. ASSOCIATED PRESS

Interstate-10 westbound out of New Orleans continues to be jammed with traffic as residents evacuate ahead of Hurricane Katrina on Sunday, Aug. 28, 2005. The Category 5 storm is expected to make landfall on Monday. ASSOCIATED PRESS

New Orleans city officials gather around Mayor Ray Nagin and Louisiana Governor Kathleen Blanco during a hurricane press conference at New Orleans City Hall, Saturday, August 27, 2005. ASSOCIATED PRESS

A Louisiana National Guardsmen holds back residents as they gather outside the Louisiana Superdome in New Orleans on Sunday, Aug. 28, 2005. The Superdome opened Sunday to residents of New Orleans who are seeking shelter from Hurricane Katrina which is expected to make landfall on Monday. ASSOCIATED PRESS

Vehicles leave New Orleans Sunday morning, Aug. 28, 2005, as Hurricane Katrina approaches. The Louisiana Superdome is shown in the background. Katrina strengthened to a dangerous Category 5 storm on Sunday with 160 mph sustained wind as residents of south Louisiana jammed freeways in a rush to get out of the low-lying region and head inland to higher ground. ASSOCIATED PRESS

High winds and rain pound the Louisiana Superdome and New Orleans as Hurricane Katrina makes landfall along the Louisiana coast on Monday, Aug. 29, 2005. Officials report that part of the roof of the Superdome was blown off because of the storm and the facility, which is housing some 10,000 evacuees, is leaking. ASSOCIATED PRESS

A vehicle makes its way through a flooded street from the overflowing Grande Lagoon in Pensacola, Fla., as Hurricane Katrina passes through the area, Monday, Aug. 29, 2005. ASSOCIATED PRESS

Sarah Vornholt, front, and Aarica Stone frolic in the surf of Grande Lagoon in Pensacola, Fla. as the outer bands of Hurricane Katrina pass through the area Monday, Aug. 29, 2005. ASSOCIATED PRESS

Arnold James tries to keep his feet as a strong gust nearly blows him over as he tries to make his way on foot to the Louisiana Superdome in New Orleans on Monday, Aug. 29, 2005. The roof on James's home blew off, forcing him to seek shelter at the Superdome. ASSOCIATED PRESS

Volunteer Mickey Monceaux carries David Johnson, who could not walk, to safety after he used his boat to rescue Johnson and other residents from a flooded neighborhood on the east side of New Orleans, Wednesday, Aug. 31, 2005. Hurricane Katrina left much of the city under water. Officials called for a mandatory evacuation of the city, but many residents remained in the city and had to be rescued from flooded homes and hotels. ASSOCIATED PRESS

Bryan Vernon and Dorothy Bell take refuge on their roof top as Hurricane Katrina hits, causing flooding in their New Orleans neighborhood, Monday Morning, Aug. 29, 2005. Officials called for a mandatory evacuation of the city, but many resident remained in the city. ASSOCIATED PRESS

Linda Lewis, right and her daughter Jyvonne react as they look towards the Hyatt Hotel in New Orleans where their room was blown out when Hurricane Katrina brought 140mph winds to the Crescent City on Monday, Aug. 29, 2005. ASSOCIATED PRESS

A tattered U.S. Flag flies in the foreground of the Hyatt, in New Orleans, Monday, Aug. 29, 2005, where dozens of windows were blown out when Hurricane Katrina made land fall. ASSOCIATED PRESS

James Smith wades past a storm damaged building after Hurricane Katrina struck the Gulf Coast Monday, Aug. 29, 2005 in Gulfport, Miss. ASSOCIATED PRESS

Jonathan Harvey wades through flood waters after rescuing his dog "Cuddles" from his flooded home after Hurricane Katrina struck the Gulf Coast Monday, Aug. 29, 2005 in Gulfport, Miss. ASSOCIATED PRESS

Flooding takes place after Hurricane Katrina hit New Orleans, Monday Morning, Aug. 29, 2005. Following the storm Louisiana officials said people in some swamped neighborhood were feared dead, but gave no immediate numbers. ASSOCIATED PRESS

Some of the thousands of displaced residents take cover from Hurricane Katrina at the Superdome, a last-resort shelter, in New Orleans about midnight, Sunday, Aug. 28, 2005. Officials called for a mandatory evacuation of the city, but many residents remained in the city. ASSOCIATED PRESS

The Mound Underpass on Interstate-10 is flooded near downtown New Orleans on Monday, Aug. 29, 2005, as Hurricane Katrina dumped torrential rain and battered the city when it made landfall near Grand Isle. ASSOCIATED PRESS

Waves crash against a boat washed onto Highway 90 as Hurricane Katrina hits the Gulf Coast Monday, Aug. 29, 2005 in Gulfport, Miss. ASSOCIATED PRESS

Palm trees are bent from the force of Hurricane Katrina in an area hit by hurricane Ivan last September in the Grande Lagoon area of Pensacola, Fla. Monday, Aug. 29, 2005. Construction material from the home being renovated after Ivan blows in the breeze. ASSOCIATED PRESS

New Orleans residents walk through chest deep floodwater after Hurricane Katrina made landfall on the Louisiana coast on Monday, Aug. 29, 2005. ASSOCIATED PRESS

St. Berard Parish deputy sheriff Jerry Reyes uses his boat to rescue residents after Hurricane Katrina hit the area causing flooding in their New Orleans neighborhood, Monday Morning, Aug. 29, 2005. Officials called for a mandatory evacuation of the city, but many resident remained in the city. ASSOCIATED PRESS

The North side of the Hyatt hotel in New Orleans was shredded by 140mph winds when Hurricane Katrina made landfall on the Louisiana coast on Monday, Aug. 29, 2005. ASSOCIATED PRESS

Gulfport Miss. Police Officer Terrence Gray, right, helps evacuate Lovie Mae Allen and group of children from their flooded homes after Hurricane Katrina struck the Gulf Coast Monday, Aug. 29, 2005 in Gulfport, Miss. ASSOCIATED PRESS

Floodwaters from Hurricane Katrina flow over a levee along Inner Harbor Navigaional Canal near downtown New Orleans Tuesday, Aug. 30, 2005. Hurricane Katrina did extensive damage when it made landfall on Monday. ASSOCIATED PRESS

A young man walks through chest deep flood water after looting a grocery store in New Orleans on Tuesday, Aug. 30, 2005. Floodwaters continue to rise in New Orleans after Hurricane Katrina did extensive damage when it made landfall on Monday. ASSOCIATED PRESS

Rescue personnel bring flood victims by boat to an Interstate-10 on ramp in the flooded city of New Orleans on Tuesday, Aug. 30, 2005. Water continues to rise after the onslaught of Hurricane Katrina which pounded the coast on Monday. ASSOCIATED PRESS

A resident is rescued from the roof top of a home by the U.S. Coast Guard as floodwaters from Hurricane Katrina cover the streetsTuesday, Aug. 30, 2005 in New Orleans. ASSOCIATED PRESS

A section of I-10 that was damaged by Hurricane Katrina is shown, Tuesday, Aug. 30, 2005, east of New Orleans. ASSOCIATED PRESS

Vehicles damaged by Hurricane Katrina sit in floodwaters, Tuesday, Aug. 30, 2005, in Slidell, La. ASSOCIATED PRESS

Alex Curtis, 12, sits in front of damage from Hurricane Katrina Tuesday, Aug. 30, 2005 in Biloxi, Miss. Curtis said his family's roof was ripped off in the storm. ASSOCIATED PRESS

A man walks past a shrimp boat Tuesday Aug. 30, 2005 in Bayou La Batre, Ala., that was blown up on the dock after Hurricane Katrina came through the area Monday. ASSOCIATED PRESS

A New Orleans family tries to make their way through floodwaters in the downtown area of the Crescent City on Tuesday, Aug. 30, 2005. The water continues to rise after Hurricane Katrina pounded the area on Monday. ASSOCIATED PRESS

Aerial sections of the I-10 bridge east of New Orleans which were damaged by Hurricane Katrina are shown in this aeiral view Tuesday, Aug. 30, 2005 in New Orleans, Louisiana. ASSOCIATED PRESS

Flood waters from Hurricane Katrina fill the streets near downtown New Orleans Tuesday, Aug. 30, 2005 in New Orleans. Hurricane Katrina did extensive damage when it made landfall on Monday. ASSOCIATED PRESS

Homes destroyed by Hurricane Katrina are shown in this aerial view, Tuesday, Aug. 30, 2005, in New Orleans. ASSOCIATED PRESS

A man hangs the American flag among debris in this aerial view of damage from Hurricane Katrina Wednesday, Aug. 31, 2005 in Gulfport, Miss. ASSOCIATED PRESS

An apartment complex damaged by Hurricane Katrina is shown in this aerial view Wednesday, Aug. 31, 2005 in Long Beach, Miss. ASSOCIATED PRESS

The damage from Hurricane Katrina near New Orleans is seen from Air Force One, Wednesday, Aug. 31, 2005. President Bush viewed the damage on his early return to Washington in order to see the devastation. ASSOCIATED PRESS

A sign directs officials and volunteers to the evacuee staging area at the Astrodome in Houston, Wednesday, Aug. 31, 2005. More than 20,000 people affected by Hurricane Katrina are expected to be transported from the New Orleans Superdome to the Astrodome for shelter. ASSOCIATED PRESS

President Bush looks out the window of Air Force One over New Orleans, Wednesday, Aug. 31, 2005, to survey the damage from Hurricane Katrina. ASSOCIATED PRESS

Volunteer Mickey Monceaux lifts Vianna Dilbert, 86, as he and others help rescue flood victims from a senior citizen's apartment complex on the east side of New Orleans, Wednesday, Aug. 31, 2005. Hurricane Katrina left much of the city under water. Officials called for a mandatory evacuation of the city, but many resident's remained in the city and had to be rescued from flooded homes and hotels. ASSOCIATED PRESS

Evacuees from the floodwaters of Hurricane Katrina are lined up along I-10 Wednesday, Aug. 31, 2005 in New Orleans. ASSOCIATED PRESS

New Orleans residents are rescued by helicopter from the floodwaters of Hurricane Katrina Wednesday, Aug. 31, 2005 in New Orleans. ASSOCIATED PRESS

New Orleans residents wait to be rescued from the floodwaters of Hurricane Katrina Wednesday, Aug. 31, 2005 in New Orleans. ASSOCIATED PRESS

New Orleans residents are rescued by helicopter from the floodwaters of Hurricane Katrina Wednesday, Aug. 31, 2005 in New Orleans. ASSOCIATED PRESS

New Orleans residents wait to be rescued from the floodwaters of Hurricane Katrina Wednesday, Aug. 31, 2005 in New Orleans. ASSOCIATED PRESS

Orleans Parish prisoners are evacuated from the floodwaters of Hurricane Katrina Wednesday, Aug. 31, 2005 in New Orleans. ASSOCIATED PRESS

Residents wait to be rescued from the floodwaters of Hurricane Katrina Thursday, Sept. 1, 2005 in New Orleans. ASSOCIATED PRESS

A helicopter flies near the Louisianna Superdome as evacuees wait to be moved Thursday, Sept. 1, 2005 in New Orleans. ASSOCIATED PRESS

Residents are rescued by helicopter from the floodwaters of Hurricane Katrina Thursday, Sept. 1, 2005 in New Orleans. ASSOCIATED PRESS

A woman and her child wait with hundreds of other flood survivors at the Convention Ccenter in New Orleans, Thursday, Sept. 1, 2005. Thousands of storm refugees had been assembling outside for days, waiting for help to come. ASSOCIATED PRESS

A SWAT team drives past flood victims waiting at the Convention Center in New Orleans, Thursday, Sept. 1, 2005. Officials called for a mandatory evacuation of the city, but many residents remained in the city and had to be rescued from flooded homes and hotels and remain in the city awaiting a way out. ASSOCIATED PRESS

Noe Morua pushes his bike past a flooded mobile home park in Homestead, Fla., Friday, Aug. 26, 2005. Hurricane Katrina flooded streets, darkened homes and felled trees as it plowed across South Florida before emerging over the Gulf of Mexico. ASSOCIATED PRESS

New Orleans residents walk through floodwaters that besiege the Crescent City on Tuesday, Aug. 30, 2005. Hurricane Katrina devastated the Louisiana and Mississippi coasts when it came ashore on Monday. ASSOCIATED PRESS

Thomas Green sits atop Interstate-10 in the flooded city of New Orleans on Tuesday, Aug. 30, 2005. Green and his family were rescued from their flooded home in the 8th Ward of the Crescent City by emergency personnel. At right is his wife Quentina. ASSOCIATED PRESS

New Orleans residents walk through floodwaters that besiege the Crescent City on Tuesday, Aug. 30, 2005. Hurricane Katrina devastated the Louisiana and Mississippi coasts when it came ashore on Monday. ASSOCIATED PRESS

Rescue personnel search from victims as they traverse the New Orleans 8th Ward in the flooded city of New Orleans on Tuesday, Aug. 30, 2005. Water continues to rise after the onslaught of Hurricane Katrina which pounded the coast on Monday. ASSOCIATED PRESS

Hundreds of residents funnel into the Louisiana Superdome in New Orleans on Sunday, Aug. 28, 2005. The Superdome opened Sunday to residents to New Orleans who are seeking shelter from Hurricane Katrina which is expected to make landfall on Monday. ASSOCIATED PRESS

Houses in New Orleans 8th Ward are surrounded by water in the flooded city of New Orleans on Tuesday, Aug. 30, 2005. Water continues to rise after the onslaught of Hurricane Katrina which pounded the coast on Monday. ASSOCIATED PRESS

A New Orleans resident walks through floodwaters coated with a fine layer of oil in the flooded downtown area on Tuesday, Aug. 30, 2005. Hurricane Katrina pounded the area when it made landfall Monday and water is still rising in the Crescent City. ASSOCIATED PRESS

Stranded residents wait on a bridge surrounded by floodwaters from Hurricane Katrina Tuesday, Aug. 30, 2005 in New Orleans. ASSOCIATED PRESS

Floodwaters from Hurricane Katrina flow through a broken section of a levee Tuesday, Aug. 30, 2005, in New Orleans. ASSOCIATED PRESS

Prisoners from the Orleans Parish Prison are staged on the highway as floodwaters from Hurricane Katrina cover the streets Tuesday, Aug. 30, 2005 in downtown New Orleans. ASSOCIATED PRESS

From an aerial view floodwaters from Hurricane Katrina fill the streets near I-10 in downtown New Orleans Tuesday, Aug. 30, 2005. ASSOCIATED PRESS

Residents wait atop a roof as floodwaters from Hurricane Katrina fill the streets of New Orleans Tuesday, Aug. 30, 2005. Hurricane Katrina did extensive damage when it made landfall on Monday. ASSOCIATED PRESS

Boats damaged by Hurricane Katrina are stacked on top of one another Tuesday, Aug. 30, 2005 in New Orleans. ASSOCIATED PRESS

Floodwaters from Hurricane Katrina cover a portion of New Orleans Tuesday, Aug. 30, 2005. ASSOCIATED PRESS

This Aug. 30, 2005 file photo shows Evelyn Turner, right, with friends and family, waiting with the body of her common-law husband, Xavier Bowie, after he died in New Orleans. Xavier and Turner had decided to ride out Hurricane Katrina when they could not find away to leave the city. Xavier, who had lung cancer, died when he ran out of oxygen Tuesday afternoon. At an estimated $81 billion in property damage, it is the costliest natural disaster in U.S. history. But to many, especially to those in greater New Orleans, this catastrophe was anything but an act of God. ASSOCIATED PRESS

In this Aug. 30, 2005, file photo, The Louisiana Superdome is shown in this aerial view, which was damaged by Hurricane Katrina, surrounded by floodwaters, in New Orleans. Top researchers now agree that the world is likely to get stronger, but fewer, hurricanes in the future because of global warming, seeming to settle a scientific debate on the subject. ASSOCIATED PRESS

From an aerial view a bulldozer clears debris from Hurricane Katrina Wednesday, Aug. 31, 2005, in Long Beach, Miss. ASSOCIATED PRESS

Two men call for a rescue boat from a flooded neighborhood on the east side of New Orleans, Wednesday, Aug. 31, 2005. Hurricane Katrina left much of the city under water. Officials called for a mandatory evacuation of the city, but many resident remained in the city and had to be rescued from flooded homes and hotels. ASSOCIATED PRESS

Sheila Dixon of New Orleans weeps as she clutches her 18-month-old daughter Emily as they sit on the side of Interstate-10 after being airlifted out of flood besieged New Orleans on Wednesday, Aug. 31, 2005. Dixon wept uncontrollably, saying that everything she had was lost and not idea where she was being taken. ASSOCIATED PRESS

Debris from Hurricane Katrina burns in the background of an area damaged by the hurricane Wednesday, Aug. 31, 2005 in Long Beach, Miss. ASSOCIATED PRESS

Perry Williams, left, helps a local store owner clean up after his shop was nearly destroyed by Hurricane Katrina in Gulfport, Miss., on Wednesday, Aug. 31, 2005. Residents are still without power or running water following the hurricanes landfall on Monday. ASSOCIATED PRESS

New Orleans residents wait to be rescued from the floodwaters of Hurricane Katrina Wednesday, Aug. 31, 2005 in New Orleans. ASSOCIATED PRESS

Rhonda Braden walks through the destruction in her childhood neighborhood, Wednesday Aug. 31, 2005 in Long Beach, Miss. Braden was there checking on her father's house that received major water damage from Hurricane Katrina. ASSOCIATED PRESS

New Orleans residents are rescued by helicopter from the floodwaters of Hurricane Katrina Wednesday, Aug. 31, 2005 in New Orleans. ASSOCIATED PRESS

New Orleans firefighters walks through flood water to help battle a building fire in downtown New Orleans, Wednesday, Aug. 31, 2005. Hurricane Katrina left much of the city under water. Officials were uncertain on the cause. ASSOCIATED PRESS

Orleans Parish prisoners are evacuated from the floodwaters of Hurricane Katrina Wednesday, Aug. 31, 2005 in New Orleans. ASSOCIATED PRESS

New Orleans residents wait on a roof top to be rescued from the floodwaters of Hurricane Katrina Wednesday, Aug. 31, 2005 in New Orleans. ASSOCIATED PRESS

In this Aug. 31, 2005 picture, New Orleans Police and volunteers use boats to rescue residents from a flooded neighborhood on the east side of New Orleans. Hurricane Katrina left much of the city under water. ASSOCIATED PRESS

This Wednesday, Aug. 31, 2005 picture shows cars piled up among other debris from Hurricane Katrina in Gulfport, Miss. ASSOCIATED PRESS

Residents wait to be evacuated from the Louisianna Superdome Thursday, Sept. 1, 2005 in New Orleans. ASSOCIATED PRESS

Thousands of New Orleans residents gather at a evacuation staging area along Interstate-10 in Metarie, La., on Thursday, Sept. 1, 2005. The residents were either evacuated by air or walked to the Interstate to escape the city still besieged by flooding and no electricity. ASSOCIATED PRESS