While a curve back out to sea is widely expected and forecast in models, any impacts Erin could have on Florida and the U.S. remains uncertain.

Tropical Storm Erin is continuing to move west and is forecast to become a hurricane later this week, according to the National Hurricane Center.

Erin is moving fast across the Atlantic, at 22 mph. It's forecast not only to become the Atlantic season's first hurricane, but also a major hurricane. A major hurricane is one that's a Category 3 or higher, with maximum sustained winds of at least 111 mph.