Heavy rain was still possible.
Laura's arrival comes just days before the August 29 anniversary of Hurricane Katrina, which breached the levees in New Orleans, flattened much of the MS coast and killed as many as 1,800 people in 2005.
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Though Marco is already weakening, Laura's strongest days are still ahead of it, even as it brought torrential rains to Puerto Rico, the Bahamas, and Hispaniola over the weekend.
Jefferson County, which includes Port Arthur, also issued an evacuation order for 6:30 a.m. Tuesday, and Orange County, to the northeast, issued a 6 a.m. Tuesday evacuation order.
Marco continued to weaken Monday. "But it's still going to be a tropical depression or a mini-tropical storm".
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Marco was forecast to dissipate by early Wednesday.
It is forecast to become a hurricane Tuesday, and it is forecast to approach the U.S. Gulf Coast on Wednesday night.
Laura is moving west-northwest at 16 miles per hour, with landfall possible between western Louisiana and eastern Texas, the center says. When Katrina struck, the wind caused damage, but the storm surge "put the nail in the coffin", said Burke, who owns Bay Books in nearby Bay St. Louis. "It's too risky to be on a ladder or carrying plywood".
Tropical Storm Laura is having to deal with the high terrain of Cuba this morning.
When Laura enters the Gulf of Mexico on Tuesday, the forecast gets interesting. It's far from impossible - the elements are there to support the potential for explosive strengthening: warm Gulf of Mexico water in the mid- to upper 80s, low wind shear and plenty of moisture.
Should that happen, the rapid intensification would occur from Tuesday afternoon to Wednesday afternoon. Now, forecasters say there is a significant threat of tornadoes from Laura as the potent storm makes landfall and moves inland. Harvey stalled over eastern Texas for days and brought several feet of rain and catastrophic flooding. Hurricane warnings were issued from San Luis Pass, Texas, to Intracoastal City, Louisiana; and storm surge warnings from the Port Arthur, Texas, flood protection system to the mouth of the Mississippi River.