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

It could become a tropical or subtropical storm during the next 24 hours, forecasters said. Tropical storms have winds of at least 39 mph.

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

(Copyright 2007 by The Associated Press. All Rights Reserved.)