Forecasters say Erin will likely become a major hurricane by the weekend, but it's still too early to determine what sort of impacts the storm could have, if any, on the U.S. East Coast.

Tropical Storm Erin is forecast to strengthen into the first hurricane of the Atlantic season by Wednesday and could become a major Category 3 hurricane by the weekend. But as of now, Erin is not expected to post a direct threat to the U.