A tropical storm is forecast to form on Thursday off Mexico that will likely strengthen into a hurricane this week, causing the government to issue warnings for popular tourist beach resorts on the Pacific coast, the National Hurricane Center (NHC) said. Tropical Depression Two-E was expected to become a tropical storm as it moved west-northwestward off Mexico at about 13 miles per hour (21 km/h), the U.S.-based NHC said. Mexico's government issued a hurricane watch from the port of Lazaro Cardenas in the western state of Michoacan to Cabo Corrientes in Jalisco state farther northwest.