Additional strengthening is expected on Monday as Hurricane Erin is forecast to “remain a large and dangerous major hurricane through the middle of this week,” the National Hurricane Center said.

The Atlantic basin includes the northern Atlantic Ocean, Caribbean Sea and Gulf of America, as the Gulf of Mexico is now known in the U.S. per an order from President Trump. NOAA and the National Hurricane Center are now using Gulf of America on its maps and in its advisories.

The Outer Banks in North Carolina are under evacuation warning as Hurricane Erin whips up potentially 20-foot high waves and flooding along the east coast.

Local officials say they only order evacuations ahead of hurricanes when it’s necessary to protect the public.

The storm will remain a major hurricane through the middle of the week, according to the National Hurricane Center.

Tropical Storm Erin continues its westward path across the Atlantic, expected to become a hurricane Aug. 15, and a major hurricane by Sunday morning.