A broad area of thunderstorms in the central Atlantic Ocean has developed into the 13th named storm of the 2013 hurricane season.
Subtropical Storm Melissa has sustained winds of 50 mph and is moving northwest, the National Hurricane Center said. It is not considered a direct threat to land.
While tropical storms generally have a well-defined center and are powered exclusively by warm water, subtropical storms are often broader and can be powered by other factors.
Located more than 700 miles east-southeast of Bermuda, the system is expected to continue moving north in the next few days.
Tropical or subtropical storms in November are unusual, particularly in the central Atlantic, but not rare.
Hurricane season technically ends on Nov. 30.