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MIAMI (AP) - A new tropical storm warning has been issued along Louisiana's Gulf Coast as Tropical Storm Isaac approaches.

The new warning was issued early Monday and covers the area from Morgan City, La., westward to Intracoastal City, La. Already in effect is a hurricane warning that covers a roughly 300-mile stretch of the Gulf Coast in four states from Louisiana to the Florida Panhandle.

Tropical storm warnings are also in effect for many areas along Florida's Gulf Coast.

So far, Isaac has brought drenching rain to Tampa, Fla., the site of the Republican National Convention, which was scheduled to begin Monday. But the storm is expected to hit the Gulf Coast on Tuesday or Wednesday as a hurricane.