MIAMI (AP) - Tropical Storm Lenny escalated to hurricane strength Sunday, bringing thunderstorms and a threat of flooding to Jamaica. Sunday evening, Lenny's center was about 160 miles southwest of Kingston, Jamaica, with top sustained winds of 80 mph, the National Hurricane Center in Miami reported. A tropical storm becomes a hurricane once its top sustained winds reach 74 mph. Lenny, the 12th named storm of the Atlantic season, was moving east at about 6 mph. Forecasters expect 5 to 10 inches of rain and storm surge flooding of 2 to 5 feet above normal tide levels along the island's coast. A tropical storm warning and a hurricane watch was in effect for Jamaica, and a hurricane watch was in effect for the southern coast of Haiti, the National Hurricane Center reported.