"More notable strengthening seems likely by the weekend," and the system is forecast to become a hurricane by Sunday.

A new tropical depression formed Wednesday that is forecast to become Tropical Storm Gabrielle and strengthen further into a hurricane in the Atlantic, according to the National Hurricane Center.

If it does become a hurricane, it'll be only the second of the Atlantic hurricane season, following Erin, which became a hurricane in the central Atlantic just over a month ago, on Aug. 15.