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.

Hurricane forecasters were eyeing two developing tropical systems in the Atlantic Ocean Aug. 10 – one of which could pose an eventual risk to the United States.

Henriette regained tropical storm strength in the Pacific Ocean well east of Hawaii on Saturday, but forecasters said it was still not expected to pose a threat to land.