Gordon is expected to produce total rain accumulations of 50-100 mm over the central and northwestern Bahamas, the Florida Keys, and South Florida through early Tuesday.
The NHC's hurricane warning covers all of coastal MS and Alabama, with a tropical storm warning reaching to Morgan City, Alabama, and Florida's Okaloosa-Walton County Line.
New Orleans Mayor LaToya Cantrell issued a voluntary evacuation notice for areas outside of the New Orleans levee system ahead of Tropical Storm Gordon.
The potential storm will continue to track north through Wednesday. Tropical Storm Warnings are also in effect for inland areas of Collier, Miami-Dade and Monroe counties.
Separately, the Atlantic was expected "to stay active" in the coming days, the National Hurricane Center said. Some area in southern Florida may receives 8 inches.
A Tropical Storm Warning was issued along the South Florida coast from Golden Beach to Bonita Beach, and for the Florida Keys from Craig Key to Ocean Reef, including Florida Bay.
The hurricane center said Sunday evening that the weather system, then known as Tropical Cyclone Seven, was 115 miles east-southeast of Marathon and had maximum sustained winds of 30 mph at about 2 a.m. ET on Monday.
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The storm left many businesses on Florida's Gulf Coast feeling shortchanged by the holiday weekend. Gordon was moving 15 miles per hour northwest with maximum sustained winds of 65 miles per hour.
Should this become a named storm, it would be called Gordon.
No coastal watches or warnings are in effect.
Sustained winds of tropical-storm-force are likely in the zone under a hurricane warning, with the possibility of hurricane-force gusts, over 74 miles per hour.
Governors in Alabama, Mississippi and Louisiana all declared states of emergency to better mobilize state resources and National Guard troops for the storm. A Flood Watch is in effect for those same counties through Monday evening.
The National Weather Service said current conditions were "somewhat favourable" for tornadoes in affected parts of South Florida on Monday.
A tropical depression or tropical storm may form in the Northern Gulf of Mexico this week.
The storm's predicted track had shifted slightly east as of Monday evening, meaning Louisiana is now just outside the area under the hurricane warning.