Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. NHC: Subtropical Storm Alberto Forms Over Northwestern Caribbean Sea by Reuters Subtropical storm Alberto formed over the northwestern Caribbean Sea, the U.S. National Hurricane Center (NHC) said in its latest advisory on Friday. The system is located about 55 miles (90 km) south of Cozumel, Mexico, packing maximum sustained winds of 40 miles per hour (65 kph), the Miami-based weather forecaster said. "Heavy rainfall expected to affect the Yucatan peninsula, western Cuba, Florida and the northeastern Gulf Coast through the weekend," NHC said.