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.

Tropical Storm Erin is tracking quickly westward through the open Atlantic waters and should become increasingly organized in the coming days, potentially reaching major hurricane intensity this weekend as it tracks just north of the Caribbean islands, where it could bring rain and gusty winds.

Tropical Storm Erin is on track to begin strengthening in the next day or so, likely to hurricane status as soon as Friday. The National Hurricane Center’s latest forecast keeps the storm north of Puerto Rico and the Virgin Islands,