MIAMI BEACH, Fla. (AP) - Forecasters say they still expect Tropical Storm Gordon to become a hurricane before making landfall somewhere along or near the Mississippi coast. The U.S. National Hurricane Center says the center of the storm is about 145 miles (235 kilometers) east-southeast of the mouth of the Mississippi River. Gordon's top sustained winds are 65 mph (100 kph), but the storm is forecast to go above the 74 mph (120 kph) threshold to be a hurricane before hitting land late Tuesday or on Wednesday. Heavy rain is already falling over western Florida and is expected to spread west along the coast to New Orleans. A storm surge warning is in effect from Shell Beach, Louisiana, to Dauphin Island, Alabama. Forecasters say the region could see life-threatening, rising waters of 3 to 5 feet (0.9 to 1.5 meters). A hurricane warning is in effect for all the Alabama and Mississippi coast.