New Orleans, US Gulf Coast Prepare For Approaching Isaac

(Photo by Chris Graythen/Getty Images)

A sign in the French Quarter asks shoppers to return another day ahead of Tropical Storm Isaac on August 27, 2012 in New Orleans, Louisiana. Tropical Storm Isaac is expected to strengthen into at least a Category 1 hurricane before making landfall near Louisiana. (Photo by Chris Graythen/Getty Images)

New Orleans, US Gulf Coast Prepare For Approaching Isaac

(Photo by Chris Graythen/Getty Images)

Workers place plywood on the windows of the Royal Sonesta Hotel on Bourbon St. to prepare for Tropical Storm Isaac on August 27, 2012 in New Orleans, Louisiana. Tropical Storm Isaac is expected to strengthen into at least a Category 1 hurricane before making landfall near Louisiana. (Photo by Chris Graythen/Getty Images)

New Orleans, US Gulf Coast Prepare For Approaching Isaac

(Photo by Chris Graythen/Getty Images)

Bourbon street remains vitrually empty ahead of Tropical Storm Isaac on August 27, 2012 in New Orleans, Louisiana. Tropical Storm Isaac is expected to strengthen into at least a Category 1 hurricane before making landfall near Louisiana. (Photo by Chris Graythen/Getty Images)

New Orleans, US Gulf Coast Prepare For Approaching Isaac

(Photo by Chris Graythen/Getty Images)

Workers place plywood on the windows of the Royal Sonesta Hotel on Bourbon St. to prepare for Tropical Storm Isaac on August 27, 2012 in New Orleans, Louisiana. Tropical Storm Isaac is expected to strengthen into at least a Category 1 hurricane before making landfall near Louisiana. (Photo by Chris Graythen/Getty Images)

New Orleans, US Gulf Coast Prepare For Approaching Isaac

(Photo by Chris Graythen/Getty Images)

People ride bicycles down a virtually empty Bourbon street ahead of Tropical Storm Isaac on August 27, 2012 in New Orleans, Louisiana. Tropical Storm Isaac is expected to strengthen into at least a Category 1 hurricane before making landfall near Louisiana. (Photo by Chris Graythen/Getty Images)

New Orleans, US Gulf Coast Prepare For Approaching Isaac

(Photo by Chris Graythen/Getty Images)

A worker attaches plywood to the window of his shop ahead of Tropical Storm Isaac on August 27, 2012 in New Orleans, Louisiana. Tropical Storm Isaac is expected to strengthen into at least a Category 1 hurricane before making landfall near Louisiana. (Photo by Chris Graythen/Getty Images)

New Orleans, US Gulf Coast Prepare For Approaching Isaac

(Photo by Chris Graythen/Getty Images)

A sign in the French Quarter making fun of Tropical Storm Isaac on August 27, 2012 in New Orleans, Louisiana. Tropical Storm Isaac is expected to strengthen into at least a Category 1 hurricane before making landfall near Louisiana. (Photo by Chris Graythen/Getty Images)

New Orleans, US Gulf Coast Prepare For Approaching Isaac

(Photo by Chris Graythen/Getty Images)

A sign in the French Quarter invites people in ahead of Tropical Storm Isaac on August 27, 2012 in New Orleans, Louisiana. Tropical Storm Isaac is expected to strengthen into at least a Category 1 hurricane before making landfall near Louisiana. (Photo by Chris Graythen/Getty Images)

New Orleans, US Gulf Coast Prepare For Approaching Isaac

(Photo by Chris Graythen/Getty Images)

A sign in the French Quarter making fun of Tropical Storm Isaac on August 27, 2012 in New Orleans, Louisiana. Tropical Storm Isaac is expected to strengthen into at least a Category 1 hurricane before making landfall near Louisiana. (Photo by Chris Graythen/Getty Images)

US Gulf Coast Prepares For Hurricane Isaac

(Photo by Chris Graythen/Getty Images)

Theresa Bartholomew holds onto her dog Max before giving him temporarily to animal control while staying at the Plaqumines Parish hurricane shelter at the Belle Chasse Auditorium on August 27, 2012 in Belle Chasse, Louisiana. Tropical Storm Isaac is expected to strengthen into at least a Category 1 hurricane before making landfall near New Orleans, Louisiana. (Photo by Chris Graythen/Getty Images)

US Gulf Coast Prepares For Hurricane Isaac

(Photo by Chris Graythen/Getty Images)

Joseph Simpson rests on his cot in the hurricane shelter at the Belle Chasse Auditorium on August 27, 2012 in Belle Chasse, Louisiana. Tropical Storm Isaac is expected to strengthen into at least a Category 1 hurricane before making landfall near New Orleans, Louisiana. (Photo by Chris Graythen/Getty Images)