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(CNN) — After churning through the Caribbean and chugging up the Gulf of Mexico, Hurricane Isaac made landfall over southeastern Louisiana on Tuesday night — bringing with it sustained winds of 80 mph and torrential rains.

According to the National Hurricane Center, the storm’s center moved over land in Plaquemines Parish at 6:45 p.m. (7:45 p.m. ET) — one day before the seventh anniversary of Hurricane Katrina, which left nearly 1,800 dead and caused billions of dollars worth of damage along the Gulf Coast.

An advisory issued an hour earlier indicated that steady hurricane-force winds of 74 mph and stronger were being felt 60 miles out, mostly to the east and northeast, from Isaac’s eye. Sporadic gusts were even stronger, including a 106 mph wind reading from high up on an oil rig off the southeast Louisiana coast.

Even with the worst likely yet to come, the storm already has caused significant surges and flooding in a number of locales, and not just those directly in Isaac’s path. Storm surges of 8.8 feet were reported in Shell Beach, Louisiana; 5.5 feet in Waveland, Mississippi; and 3.1 feet in Pensacola, Florida, according to the hurricane center.

These surges likely will get worse, with forecasters predicting water levels to rise between 6 to 12 feet on the coast in Mississippi and southeastern Louisiana alone.

Mississippi state authorities have noted that waters have gone up around the state faster than expected, something Jim Yelverton noticed as he surveyed the Tchoutacabouffa River in Biloxi. He estimated Tuesday afternoon that this river was 6 to 8 feet higher than normal, and at low tide, expressing concerns about even more flooding during high tide Wednesday morning.

“The fact that we haven’t had any rain and that we’ve got six to eight hours before the real fun begins … makes me nervous,” echoed Jon McDougal, another CNN iReporter who documented flooding in nearby Gulfport.

Intense rains alone could cause major headaches, and flooding, especially given Isaac’s slow progression.

Having at one point swept through the Caribbean at 21 mph, Isaac’s movement slowed Tuesday to 8 mph — a rate that may drop even further before it makes landfall sometime in the evening along the southwestern Louisiana coast. Because Isaac is moving at such a slow clip, CNN meteorologist Chad Myers estimate some residents could experience hurricane or tropical storm conditions for between 24 and 36 hours before the storm finally moves on.

While over land, Isaac remained 90 miles southeast of New Orleans at 7 p.m. Tuesday. Mayor Mitch Landrieu said he expected the worst of the storm to hit his city Wednesday morning, bringing with it hurricane-force winds and between 10 and 16 inches of rain.

“We’re in a hunker down phase now, because this storm could be over us for a while with a lot of wind and rain,” Landrieu said in a statement. “Hunker down means hunker down and prepare to ride it out.”

Like Landrieu and other local and state authorities, President Barack Obama urged those in Isaac’s path to listen to authorities and stay safe.

“Now’s not the time to tempt fate,” he said from Washington, after signing an emergency declaration for the state of Mississippi like he had for Louisiana a day earlier. “Now’s not the time to dismiss official warnings. You need to take this seriously.”

Besides strong winds, Isaac could bring 14 inches of total rainfall in many places, and isolated parts of southeast Louisiana, southern Mississippi, southern Alabama and the Florida Panhandle could get as much as 20 inches, the hurricane center said.

“The combination of a storm surge and the tide will cause normally dry areas near the coast to be flooded,” the hurricane center said.

Gulf Coast residents are bracing for the worst from a storm that has already caused considerable devastation as it headed north from the Caribbean. Haiti’s civil protection agency reported at least 19 people in that country died because of the storm, which then went on to lash Cuba and the Florida Keys.

Trish Powers, a CNN iReporter from Fort Pierce on Florida’s east coast, reported that floodwater there is “almost waist deep at some … points.”

“All we can do is wait for the water to recede,” she said.

The hurricane’s “increasing winds and seas” disrupted a search for a missing man on Tuesday, Coast Guard spokesman Timothy Williams said.

The Coast Guard had been searching off the coast of Pensacola, Florida, for a “missing jet skier” whose wife reported him missing Monday night. Williams said rescue crews would “temporarily suspend their search efforts until the storm passes and weather conditions become safe enough.”

Isaac’s impact has been felt, and seen, in other ways as well — including bending trees, drenching roads and knocking down power lines.

Entergy Louisiana, one of many utilities affected by the storm, reported more than 135,000 customers without power statewide at 7:40 p.m. CT.

Isaac earlier prompted three airports to close — in New Orleans; Gulfport-Biloxi, Mississippi; and Mobile, Alabama — and cancellations of around 1,500 flights systemwide, according to airline and airport officials. In addition, the U.S. Coast Guard announced it has closed major ports along the Gulf Coast and the Mississippi River from Baton Rouge to its mouth because of the storm.

Business in many of the most affected areas came to a standstill because of Isaac. For example, 52 Walmart and Sam’s Club stores in Louisiana and nine in Mississippi had shut down by 5:30 p.m. Tuesday, their parent company said.

Amtrak has suspended its train service to and from New Orleans on Tuesday and Wednesday because of Isaac. And residents of Plaquemines Parish, located along the Gulf, are subject to a “dusk-to-dawn curfew” because of Isaac, parish officials said.

In and around New Orleans, authorities closed a number of flood protection structures. These included the West Closure Complex — one of the world’s largest pump stations, capable of pumping stormwater at 20,000 cubic feet per second — said the Army Corps of Engineers.

In Mississippi, Gov. Phil Bryant noted late Tuesday afternoon that more than 850 evacuees had found refuge in 24 shelters, with room available statewide for more than 55,000 people. About 10,000 sandbags have been distributed, and several popular casinos in Biloxi have closed temporarily.

The hurricane center has called on people at ports, docks and marinas to “urgently complete” emergency preparations. For people who live on boats, it was time to “make final preparations for securing your craft before leaving it.”

Shrimpers in Bayou Le Batre, Alabama, were among those heeding such warnings and hunkering down.

“All the boats are coming. We’re anchoring them down and getting ready for this blow, hoping it’s not too bad,” Dominick Ficarino, the owner of Dominick’s Seafood, told CNN affiliate WPMI-TV in Bayou Le Batre.

The Nuclear Regulatory Commission on Tuesday said it was sending additional inspectors to two Louisiana nuclear plants in the storm’s path, as power company Entergy planned a “controlled shutdown” of one of them starting Tuesday afternoon.

Isaac is not expected to be as strong as Katrina, which made landfall as a Category 3 storm with 125 mph winds. Even so, the head of FEMA stressed Tuesday that wind speed isn’t the only factor to consider when assessing how much damage a storm might cause.

“I know there are a lot of jaded folks on the coast that have been through Camille and then Katrina and think, well, this is just a Category 1 hurricane,” said FEMA director Craig Fugate from Mississippi. “The tendency to look at the category of the wind speed doesn’t always tell the story of what the impacts will be.”

iReporters share Hurricane Isaac photos, videos

Gulf Coast authorities and residents are praying there will be no repeat of the devastation the 2005 storm caused, especially the nearly 1,800 people killed after protective levees around New Orleans failed and flooded the city.

Col. Ed Fleming of the Army Corps of Engineers vowed that the system now in place “is the best … the greater New Orleans area has ever seen.”

Jackie Grosch, for one, trusts that the levees will hold this time. The St. Bernard Parish, Louisiana, resident, who rebuilt her home after Katrina, said her family will wait Isaac out — though they have a generator and life jackets, “just in case.”

“I don’t know if it’s going to be a true test, because they’re saying it’s not going to be that bad,” Grosch said. “But you never know what bad is. We didn’t think Katrina was going to be bad either.”

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CNN’s Josh Levs, Greg Botelho, Phil Gast, Ed Lavandera, Anika Chin, Mike Ahlers, Aaron Cooper, Ed Payne, Mariano Castillo, Matt Smith, Dave Alsup and Chelsea J. Carter contributed to this report.

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