Florence is now a major Category 3 hurricane with 120 mph winds. It's moving in the Atlantic toward Bermuda.
This comes as Gordon made landfall overnight as a Tropical Storm. It is now weakening and moving northwest. It is staying east of Texas.
A hurricane warning was in effect for the entire Mississippi and Alabama coasts with predictions Gordon would become a Category 1 storm.
Flooding was also a risk. As much as 8 inches (20 centimeters) of rain could fall in some parts of the Gulf states through late Thursday as the tropical weather moves inland toward Arkansas.
By late Tuesday morning, the storm was centered 145 miles (235 kilometers) east-southeast of the mouth of the Mississippi River, with top sustained winds of 65 mph (100 kph), forecasters said. It was moving relatively quickly, at about 15 mph (25 kph).
The last hurricane to strike the U.S. was Nate in October, coming ashore in Biloxi with 75 mph (120 kph) winds.
Governors in Alabama, Mississippi and Louisiana all declared states of emergency for Gordon, allowing them to quickly mobilize state resources and National Guard troops to help during and after the storm.
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Gordon became a tropical storm Monday near the Florida Keys, so residents and businesses rushed preparations Tuesday. But for some people, it was just another beach day with a bit of a breeze.
Morgan Kearley took the potted plants off her porch Tuesday before heading to the beach at Bay St. Louis with her husband, their daughter and a niece and nephew. They stayed near the edge of the water as a stiff breeze from the south rarely relented.
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"I think we've had worse in the past," Kearley's husband, Shane, said.
Mayors of barrier islands in the storm's path warned that their communities might get cut off from the mainland. Gordon appeared to be coming toward Dauphin Island, Alabama, closer to low tide around 7 p.m. Tuesday. Police planned to monitor the only highway to the mainland.
"When you get the higher waves, water starts splashing across. Sometimes it starts pushing not only water across but debris, logs and things of that nature, which makes it very treacherous to get across," Mayor Jeff Collier said.
Gordon was poised for only a glancing blow to New Orleans, where Mayor LaToya Cantrell said the city has "the pumps and the power" needed to protect residents.
Authorities issued a voluntary evacuation order for areas outside the city's levee protection system, including the Venetian Isles, Lake Saint Catherine and Irish Bayou communities.
L. J. Cazaux moved his boat to a nearby lot of elevated land before the rain started in Venetian Isles. He elevated his house off the ground after Hurricane Katrina in 2005 and has food, water and two generators.
"You just blend it into your lifestyle when you live outside the levee system. You know you're going to flood before anyone else does. The good part about it is the water goes down faster here," said Cazaux, who has lived in the neighborhood for 15 years.
Hurricane Florence was some 2,400 miles (3,900 kilometers) away from the U.S., and another potential storm was likely to form not far off the coast of Africa and head east.
The National Hurricane Center said it is way too early to know if either of those storms would have any impact on land.
"It's the peak of hurricane season. Now is the time to get your plans all set," Hurricane Director Ken Graham said.