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

Tropical Storm Erin formed on Monday and is expected to become a hurricane, and possibly a major hurricane, later this week.

Tropical Storm Erin is forecast to strengthen into the first hurricane of the Atlantic season by Thursday and could become a major Category 3 hurricane by Sunday. But as of now, Erin is not expected to pose a direct threat to the U.S. The forecast path takes Erin north of the Caribbean Islands, including Puerto Rico.