Tropical Storm Ernesto battered Haiti, claiming at least one life, then menaced Cuba on Monday as it followed a track that could carry it toward Florida as a revived hurricane. Ernesto became the Atlantic season's first hurricane on Sunday morning with maximum sustained winds of about 75 mph. But it weakened into a tropical storm, with 50 mph winds early Monday. At 5 a.m. ET Monday, Ernesto, the fifth named storm of the Atlantic hurricane season, was centered about 45 miles south-southeast of Guantanamo, Cuba.