NHC has initiated advisories on Potential Tropical Cyclone One (formerly AL90) located over southern Texas. Potential Tropical Cyclone Advisories (PTC Advisories) are issued when there is high confidence that the disturbance will develop into a storm and bring significant impacts. Potentially life-threatening flash and urban flooding is possible across the Texas coast eastward into central Mississippi through Thursday. Prolonged rainfall may extend the flood threat into the weekend. Widespread small stream and minor river flooding is expected along the Texas coast into southwest Louisiana, with isolated areas of significant river flooding possible across the Texas Coast and Louisiana. Potential Tropical Cyclone One is forecast to become a tropical storm as it moves along or just off the northwestern Gulf coast through Wednesday. Tropical Storm Watches have been issued from Sargent, Texas, to Morgan City, Louisiana. Minor to moderate coastal flooding is expected along portions of the Upper Texas and Louisiana coastlines.