The National Weather Service says Tropical Storm Cindy is centered about 350 miles (563.24 kilometers) southeast of Galveston, Texas.
Maximum sustained winds were clocked Tuesday evening at 45 mph (75 kph) and the storm has been nearly stationary in recent hours.
A tropical storm warning has been issued for the Gulf Coast from San Luis Pass, at the western end of Galveston Island, to the mouth of the Pearl River, where the Louisiana-Mississippi border meets the Gulf of Mexico.
Forecasts say the storm could produce overall rainfall of 6-9 inches (15-23 cms) with isolated amounts of up to 12 inches (30 cms) in spots in southeastern Louisiana and southern parts of Mississippi, Alabama and the Florida Panhandle through Thursday.
A tropical storm warning was expanded to a wider area Tuesday afternoon, now extending from San Luis Pass, Texas, to the mouth of the Pearl River on the Mississippi-Louisiana line.