Oct 3 (Reuters) - Tropical storm Karen, the eleventh named storm of the 2013 Atlantic hurricane season, was expected to move slowly northward over the central Gulf of Mexico on Friday, the U.S. National Hurricane Center said in its bulletin.
Karen was located about 340 miles (545 km) south of the mouth of the Mississippi river with maximum sustained winds of 65 miles per hour, it said. "It is anticipated that Karen will be on a weakening trend beyond 48 hours and become extra-tropical by Day 4," the NHC advisory said.
A hurricane watch is in effect for Grand Isle, Louisiana, to west of Destin, Florida, while a tropical storm warning is in effect for Grand Isle, Louisiana, to the mouth of the Pearl river. (Reporting by Arpan Varghese in Bangalore; Editing by Prateek Chatterjee)