Much of the central Gulf Coast hunkered down as Hurricane Isaac approached Tuesday. Authorities across the region warned residents to be prepared for heavy rain, high winds, coastal storm surges and flooding.

Thousands of people in Louisiana, Mississippi and Alabama were under states of emergency. The storm conjures memories of Hurricane Katrina, which slammed the region seven years ago Wednesday and killed nearly 1,800 people.

A summary of the latest preparations and situation in each state:

Louisiana

-- Gov. Bobby Jindal said the storm is moving slowly, and that will mean long-lasting and powerful winds.

-- He warned of a greater chance of heavy rain, flooding and downed tree limbs and power lines.

-- Tidal surges could occur after storms have passed through areas, the governor said.

-- More than 200,000 Entergy Louisiana customers were without power.

-- Entergy officials said they are taking one of their nuclear power plants west of New Orleans offline.

-- State government offices will be closed Wednesday.

-- The new $165-million Seabrook Floodgate at the north end of the Industrial Canal was closed for the first time for a storm event.

-- Forty-one parishes have issued emergency declarations.

-- Seven parishes announced mandatory evacuations in their jurisdictions.

-- Plaquemines Parish officials issued a curfew until to sunrise Wednesday.

-- The Department of Corrections has moved prisoners from coastal parishes to state prison facilities.

-- Flights are being halted out of the New Orleans airport Tuesday and Baton Rouge on Wednesday, authorities said.

-- Bus and street car service in New Orleans and Amtrak and Greyhound service to and from the city have been shut down.

-- President Barack Obama declared a state of emergency, and federal aid is on the way.

-- The Federal Emergency Management Agency is in charge of recovery operations, and more than 4,100 National Guard troops have been activated.

-- The Louisiana National Guard has deployed 48 boat teams and 13 communications teams.

-- New Orleans Mayor Mitch Landrieu did not issue an evacuation order but called for people outside the city's protective levees to leave.

-- The city's pump stations have backup generators ready in case of electrical outages.

-- Crews have been evacuated from oil production platforms and drilling rigs in the Gulf of Mexico.

-- The Coast Guard has closed the Mississippi River from Baton Rouge to the Gulf of Mexico and will not respond to water emergencies until after the storm passes.

-- Cargo terminals within the Port of New Orleans have ceased operations.