If the weather system meandering through the Southeast develops, it will become Tropical Storm Fay, the sixth named system of the Atlantic hurricane season.
If upgraded, Fay will be the earliest tropical storm that begins with an "F" on record. The previous record was set on July 21, 2005.
"Environmental conditions are expected to be conducive for development and a tropical or subtropical cyclone is likely to form within the next day or so," the National Hurricane Center said.
The system, currently impacting the South Carolina coast, is producing heavy rain, including offshore.
"Weve been watching the center of this system move across Georgia and the Carolinas for a few days now," CNN meteorologist Taylor Ward says. "As the center moves offshore of North Carolina and hugs the coast, it will be able to tap into the warm waters of the Gulf Stream and could become a tropical storm."