TAMPA, Fla. (WFLA) — Powerful Category 4 Hurricane Humberto picked up speed overnight on Saturday and is now moving northwest at around 13 mph, the National Hurricane Center said.

The storm is expected to start turning back toward the north Sunday morning before making a sharp turn toward the northeast and heading back for the open Atlantic by Monday evening. As of 5 a.m. on Sunday, Humberto was around 585 miles south of Bermuda.

The hurricane is not expected to make landfall, but will likely bring swells and rough seas to portions of the Caribbean islands, as well as Bermuda and the Southeast U.S.

With maximum sustained winds measuring 155 mph, Humberto is nearly a Category 5 storm, which requires speeds of 157 mph or higher. NHC predicts Humberto will retain its major hurricane status over the next few days.

Florida’s Atlantic Coast should prepare for potential tropical storm conditions starting Monday, when Tropical Depression Nine is expected to pass by on its way north. NHC said it will likely continue to strengthen as it moves through the Bahamas, bringing heavy rainfall and gusty winds.

By the end of Sunday, TD Nine is forecast to develop into a tropical storm. With current maximum wind speeds at 35 mph, the system has some more strengthening to do before it reaches tropical storm status with sustained winds of 39 mph.

TD Nine will be approaching Georgia and the Carolinas early next week, and is expected to strengthen into a hurricane by Tuesday. If it does reach hurricane status, it will be named Hurricane Imelda. The North Carolina governor declared a state of emergency ahead of the storm’s arrival to “mobilize resources and prepare for potential impacts.”