Tropical Storm Erin is forecast to strengthen into the first hurricane of the Atlantic season by Saturday morning and then become a major Category 3 hurricane by Sunday morning as it passes north of Puerto Rico. But as of now, Erin is not expected to pose a direct threat to the U.S.

See Erin’s latest track, which is expected to avoid land. Distant impacts from the storm are expected in the northern Caribbean.

Hurricane status is likely to be achieved soon as Erin continues to organize and strengthen. Once winds reach 74mph it will be classified as a Category 1 hurricane. The Saffir-Simpson Scale helps us categorize the strength of tropical systems.