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Humberto grew into a on Friday evening, "rapidly strengthening" into a major hurricane, but there were no immediate watches or warnings issued for the U.S. by the National Hurricane Center. 

The storm is swirling over the western Atlantic that could potentially bring some downstream impacts to parts of the Southeast U.S. coast, from Florida to North Carolina, the director of the Miami-based hurricane center, Michael Brennan, said.

There were no coastal watches or warnings in effect due to either storm as of Friday afternoon. 

As of Friday night, Humberto was located about 390 miles northeast of the northern Leeward Islands. It was moving west at about 7 mph with maximum sustained winds of 145 mph. A storm is deemed a "major" hurricane if it's a Category 3, 4 or 5 due to the potential for "significant loss of life and damage," the NHC says.

"Rapid strengthening should continue over the central Atlantic," the hurricane center said Friday night.

Tropical-storm-force winds extend outward up to 105 miles from the center of Humberto, and hurricane-force winds extend outward up to 25 miles, the hurricane center said.

It is the eighth named storm of the . It comes on the heels of , which is not impacting land as it heads farther out into the Atlantic.

The hurricane center is also closely monitoring a second storm system over the northeast Caribbean in the Atlantic, near Humberto. The system is likely to become a tropical depression late this week, forecasters said. 

It is likely to bring heavy rains near Puerto Rico and the Dominican Republic through Wednesday before strengthening near the Bahamas, according to the NHC.

There is also a possibility it — a phenomenon known as , in which two different storms converge and either join or spin around each other. But Autos News meteorologist Nikki Nolan said such an outcome is not considered likely in this case.