Tropical Storm Erin spaghetti models, tracker. What's ahead for Florida? Tropical Storm Erin is expected to begin strengthening Wednesday, Aug. 13. The storm is forecast to become a hurricane by Aug.

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

The National Hurricane Center is tracking 3 systems in the Atlantic basin, including a new one that appeared near the Yucatan Peninsula late Aug. 12.