Forecasters said Tropical Storm Peter formed over the Atlantic Ocean early Sunday and a new tropical depression was circling over the far eastern Atlantic.
Peter was centered about 1,015 kilometers east of the northern Leeward Islands, the United States National Hurricane Center in Miami said in a 5 a.m. EDT advisory.
The tropical storm was expected to bring rain to islands, including the Virgin Islands and Puerto Rico, until Tuesday. Forecasters were expecting rainfall of 1 to 2 inches (3 to 5 centimeters) through Tuesday.
The strongest winds were around 40 mph (65 km / h) and Peter was moving northwest at 15 mph (24 km / h). No coastal watch or warning was in effect.
Only two other Atlantic hurricane seasons have had 16 named storms on September 19 since the start of the satellite era in 1966. These were the 2005 and 2020 seasons, according to the Colorado Hurricane Researcher State University, Phil Klotzbach.
Meanwhile, the Seventeen Tropical Depression formed on Sunday. Forecasters said it was the far eastern tropical Atlantic Ocean, about 330 miles (530 kilometers) southwest of the southernmost islands of Cabo Verde.
The tropical depression had maximum sustained winds around 35 mph (55 km / h). The system was expected to become a tropical storm later on Sunday or Monday, but there was no immediate threat to land, forecasters said.