Nate was forecast to make its second landfall near Biloxi, Mississippi, and threatened to inundate homes and businesses.
The center of the storm passed to the east of New Orleans, sparing the city its most ferocious winds and storm surge. And its quick speed lessened the likelihood of prolonged rain that would tax the city's weakened drainage pump system.
The city famous for all-night partying was placed under a curfew, effective at 7 pm (local time), but the mayor lifted it when it appeared the storm would cause little problems for the city. Still, the streets were not nearly as crowded as they typically are on a last night.
Nate weakened slightly and was a Category 1 storm with maximum winds of 85 mph (137 kph) when it made landfall in a sparsely populated area of Plaquemines (PLAK'-uh-minz) Parish. Forecasters had said it was possible that it could strengthen to a Category 2, but that seemed less likely as the night wore on.
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"If it floods again, this will be it," said Larry Bertron as said as he and his wife prepared to leave their home in the Braithwaite community of vulnerable Plaquemines Parish. The hurricane veterans lost one home to Hurricane Katrina in 2005 and left the home they rebuilt after Hurricane Isaac in 2012.
Governors in Louisiana, Mississippi and Alabama declared states of emergency. The three states have been mostly spared during this hectic hurricane season.
"This is the worst hurricane that has impacted Mississippi since Hurricane Katrina," Mississippi Emergency Management Director Lee Smithson said yesterday. "Everyone needs to understand that, that this is a significantly dangerous situation."
Louisiana Governor John Bel Edwards urged residents to make final preparations quickly and stressed that Nate will bring the possibility of storm surge reaching up to 11 feet in some coastal areas.
"It's going to hit and move through our area at a relatively fast rate, limiting the amount of time it's going to drop rain," Edwards said. "But this is a very dangerous storm nonetheless."
Some people worried about New Orleans' pumping system, which had problems during a heavy thunderstorm on August 5. The deluge exposed system weaknesses - including the failure of some pumps and power-generating turbines - and caused homes and businesses to flood. Repairs have been made but the system remained below maximum pumping capacity.
On Alabama's Dauphin Island, water washed over the road yesterday on the island's low-lying west end, said Mayor Jeff Collier. The storm was projected to bring storm surges from seven to 11 feet near the Alabama-Mississippi state line. Some of the biggest impacts could be at the top of funnel-shaped Mobile Bay.
In Mississippi, Hancock County Emergency Management Director Brian Adam said his agency received reports of rising water on low-lying streets facing the Mississippi Sound and the Bay of St Louis. In Biloxi, authorities reported water from Biloxi Bay rising on some streets.