A weather system off Puerto Rico has the potential to become a tropical or subtropical storm, a little more than a week after the Atlantic hurricane season ended, forecasters said.

At 10:30 p.m. Sunday (0330 GMT Monday), the system was about 425 miles east of Puerto Rico. It was moving west at about 15 mph to 20 mph and was expected to continue this general motion over the next day or two, according to the National Hurricane Center.

Warm temperatures surrounding the area support it becoming a tropical or subtropical storm during the next 24 hours, forecasters said. Tropical storms have winds of at least 39 mph (63 kph).

The Atlantic hurricane season, which ended Nov. 30, saw 14 named storms this year, six of those were hurricanes.