MIAMI (AP) — The Latest on tropical weather. (all times local):

8:25 a.m.

Forecasters say the Alabama and Mississippi coasts could be inundated with as much as 15 inches (38 centimeters)of rain from a tropical storm in the Gulf of Mexico.

The heaviest rains are expected in an area that includes the port city of Mobile, Alabama, and the cities of Pascagoula and Biloxi in Mississippi. The forecast shows an even wider area from southeastern Louisiana into the western Florida Panhandle could receive as much as 10 inches (25 centimeters)of rain over three days.

The National Weather Service issued an expanded flash flood watch for the area Tuesday, and forecasters say the flooding threat will continue through Thursday night.

Coastal Louisiana is under a tropical storm warning. The National Hurricane Center says the storm is expected to move inshore early Thursday near the Louisiana-Texas line before weakening and moving northeastward in a sweeping arc.

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4:26 a.m.

A tropical storm warning has been issued for a section of Louisiana's coast as a weather system approaches from the Gulf of Mexico.

The warning is in effect from Cameron, Louisiana, to Intracoastal City.

The system's maximum sustained winds early Tuesday are near 40 mph (64 kph). The U.S. National Hurricane Center says some slight strengthening is possible before the system reaches the coast, either late Wednesday or Wednesday night.

As of 5 a.m. Tuesday, the system is centered about 305 miles (490 kilometers) south-southwest of the mouth of the Mississippi River and is moving northwest near 8 mph (13 kph).

Meanwhile, Tropical Storm Bret is moving along South America's northern coast. Its maximum sustained winds are near 40 mph (64 kph) with weakening expected to begin later in the day.

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