Tropical Storm Otto strengthened into a hurricane Friday as it moved northeastward over the open Atlantic, posing no immediate threat to land, the National Hurricane Center said.
Otto, the 15th named storm of the busy 2010 Atlantic hurricane season and the eighth hurricane, was packing top sustained winds of 80 miles per hour by late Friday afternoon, making it a Category 1 hurricane on the five-step Saffir-Simpson scale of intensity.