including one in the Caribbean Sea. And it's that developing system that most concerns folks in the U.S., as it could become a named storm in the Gulf of Mexico by next week, forecasters said.

A potential hurricane -- which would be named Helene -- is churning in the Caribbean and is forecast to make landfall in Florida on Thursday. The system is forecast to become Tropical Storm Helene ...

only one is a real concern for the United States and the storm-battered Southeast. The system most likely to affect the United States was located in the Caribbean Sea, the hurricane center said ...

and a "tropical depression or storm is likely to form over the next couple of days" as the system moves northward across the northwestern Caribbean Sea and into the southeastern Gulf of Mexico.