Forecasters say Tropical Storm Erin has formed in the eastern tropical Atlantic Ocean as Hurricane Henriette is strengthening in the Pacific Ocean.

Tropical Storm Henriette rapidly strengthened into a hurricane Sunday in the central Pacific Ocean with further strengthening expected, but it poses no threat to land, the National Hurricane Center said.

Tropical Storm Erin is expected to strengthen into a hurricane later this week in the Atlantic Ocean, according to the National Hurricane Center.