A tropical depression sitting off the coast of Louisiana could become Tropical Storm Lee in the next 24 hours and bring as much as 10 inches of rain to the Baton Rouge area over the next few days and higher amounts south and on the coast, a National Weather Service meteorologist said Friday.

According to a 4 a.m. National Hurricane Center advisory, a tropical storm warning is in effect from Pascagoula, Miss., west to Sabine Pass, Texas.

The tropical storm warning means tropical storm conditions are expected somewhere in the warning area, in this case, in the next 24 hours.

As of 7 a.m., the depression was 240 miles south of the mouth of the Mississippi River, said NWS meteorologist Gavin Phillips.

Maximum sustained winds for the depression were at 35 mph.

Phillips said the depression is moving very slowly to the northwest and is expected to stall off the Louisiana coast until possibly Monday.

The center of the system is expected to approach the coast of south Louisiana during the weekend, according to the advisory.

Storm or no storm, the system will bring a large amount of rain to Baton Rouge and areas south, Phillips said.

Phillips said the heaviest rain will be south of Lake Pontchartrain and on the coast with average totals possible from 15 to 20 inches, Phillips said.