MIAMI (AP) -- Tropical Storm Harvey is strengthening off the Honduras coast as the Atlantic storm threatens to bring high winds and several inches of rain to Central America.The US National Hurricane Center in Miami says in a statement Saturday that Harvey is located about 60 miles east of Roatan, moving west to west-northwestward at about 9 mph (14 kph). Maximum sustained winds are 60 mph (97 kph).Showers and thunderstorms have increased overnight.Tropical storm warnings have been issued for the north coast of Honduras from Punta Patuca westward, the Bay Islands of Honduras, the coast of Belize and parts of the southeastern coast of Mexico's Yucatan Peninsula. A tropical storm watch remains in effect for the Guatemala coast.Hurricane conditions are expected along part of the Belize coast later Saturday.