Tropical Storm Erin formed Monday and is expected to become a major hurricane as it moves across the Atlantic Ocean, according to the National Hurricane Center, though the potential risks to the U.S. remain unclear.

Tropical Storm Erin formed in the eastern Atlantic Ocean on Monday, forecasters said. The storm could strengthen to become the Atlantic's first hurricane of the season.

Tropical Storm Erin has officially formed in the Atlantic, and it could become the first hurricane of the season. The tropical storm formed on the morning of Monday, Aug. 11, and has maximum sustained winds near 45 mph, according to a public advisory from the National Hurricane Center (NHC) in Miami.