Washington, Muharram 8, 1436, Nov 1, 2014, SPA -- Tropical Storm Vance strengthened south of Mexico early Friday and could become a hurricane and move toward the country's Pacific coast this weekend, U.S. forecasters said. The National Hurricane Center (NHC) said Vance was 765 kilometers south of the beach-resort city of Acapulco at 1500 GMT, with maximum sustained winds of 72 kilometers per hour (kph), and could become a hurricane on Sunday. While the storm currently is moving south-southwest at a slow 5 kph, the NHC described the movement as erratic, adding that Vance could threaten the Pacific coast of Mexico by early next week. --SPA 15:28 LOCAL TIME 12:28 GMT www.spa.gov.sa/w