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 hatched areas on the National Hurricane Center's tropical outlook map indicate "areas where a tropical cyclone — which could be a tropical depression, tropical storm or hurricane — could develop," said National Hurricane Center Deputy Director Jamie Rhome.

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The National Hurricane Center is tracking four systems in the Atlantic, including Hurricane Erin and Invest 99L.

Hurricane Erin, now a Category 2 hurricane, won't make landfall on the U.S. East Coast, but it will impact residents and visitors at North Carolina's Outer Banks.

A tropical storm warning is in effect for: Beaufort Inlet, North Carolina to Chincoteague, Virginia, including Pamlico and Albemarle sounds. A storm surge warning means there is a danger of life-threatening inundation, from rising water moving inland from the coastline, during the next 36 hours in the indicated locations.

Hurricane watchers are eying systems in the Atlantic basin. One has a medium chance of developing later this week.

Hurricane Erin on Monday bulked back up as a major Category 4 storm with an increasing wind field as it moved near the Bahamas. Meanwhile, the National Hurricane Center increased the odds a system